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• Varnish, Nginx, Apache, APC, Meteor, Cpanel & Wordpress On A Single Server, Any Good?

  - by Aahan

  Yes, I have read many close questions, but I needed a specific answer and hence this question. First, these are my new server specifications: Linux Server (CentOS), Intel Xeon 3470 Quad Core (2.93GHz x 4) processor, 4 GB DDR3 Memory, 1TB Hard Disk Space, 10 TB Bandwidth and 9 Dedicated IPs. AIM: To speed up my wordpress blog + Increase server's capacity to handle heavy load PLAN: This is how I am planning to setup my server - - VARNISH (in the front, to cache server responses) NGINX (to effectively handle static content & overcome the C10k problem) APACHE (behind Nginx, to effectively deliver dynamic content) APC (PHP page, database & object caching) CPANEL (which requires Apache, and I require it) WORDPRESS W3 TOTAL CACHE (caching plugin for Wordpress). So , will the setup work? Have anyone tried it? Please shower your thoughts and knowledge. NOTE: I can't do without Apache because I am used to that .htaccess & Cpanel stuff. So, it's not any option. All others are options. Please try to help. I hope I am clear in what I wanted to ask.

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• Ubuntu purple splash screen with blinking pixels?

  - by joxnas

  I had ubuntu 9.10 I upgraded to 10.04 after solving some problems (freeze at boot). Since then, I don't have the ubuntu's logo showing up when I boot, but a purple screen with some blinking pixels. I didn't care much about it... but today my computer took too long at that screen (normally it was just 1/4 second, but today it was like a minute..). And it happened like 4 or 5 times in a row (Only at the 5th time I realised that it was not freezing up, but it simply would took more time) After a reboot, it is again 1/4 second of purple screen but I don't want this problem to return.. so I want to get rid of the purple screen (I think it is an indicator of the problem) Well, I already installed the graphic drivers (going to system admnistration hardware drivers). But it didn't solve anything. (I don't know if it is even related) I searched in google, found something old (2006) and I think it maybe has some relation with my problems .. http://ubuntuforums.org/archive/index.php/t-294692.html But couldn't understand the conversation (i'm a linux novice) Sorry for my horrible english.. I would appreciate any help! My hardware: ATI Mobility Radeon 4650 HD P7450 2.13Ghz Core 2 Duo

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• How to find out what is causing a slow down of the application on this server?

  - by Jan P.

  This is not the typical serverfault question, but I'm out of ideas and don't know where else to go. If there are better places to ask this, just point me there in the comments. Thanks. Situation We have this web application that uses Zend Framework, so runs in PHP on an Apache web server. We use MySQL for data storage and memcached for object caching. The application has a very unique usage and load pattern. It is a mobile web application where every full hour a cronjob looks through the database for users that have some information waiting or action to do and sends this information to a (external) notification server, that pushes these notifications to them. After the users get these notifications, the go to the app and use it, mostly for a very short time. An hour later, same thing happens. Problem In the last few weeks usage of the application really started to grow. In the last few days we encountered very high load and doubling of application response times during and after the sending of these notifications (so basically every hour). The server doesn't crash or stop responding to requests, it just gets slower and slower and often takes 20 minutes to recover - until the same thing starts again at the full hour. We have extensive monitoring in place (New Relic, collectd) but I can't figure out what's wrong; I can't find the bottlekneck. That's where you come in: Can you help me figure out what's wrong and maybe how to fix it? Additional information The server is a 16 core Intel Xeon (8 cores with hyperthreading, I think) and 12GB RAM running Ubuntu 10.04 (Linux 3.2.4-20120307 x86_64). Apache is 2.2.x and PHP is Version 5.3.2-1ubuntu4.11. If any configuration information would help analyze the problem, just comment and I will add it. Graphs info phpinfo() apc status memcache status collectd Processes CPU Apache Load MySQL Vmem Disk New Relic Application performance Server overview Processes Network Disks (Sorry the graphs are gifs and not the same time period, but I think the most important info is in there)

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• IIS6 Multiple SSL websites to a single HTTP website?

  - by docflabby

  Running a IIS6 server on Windows 2003. All the websites use ASP.NET I have a number of websites all running separate HTTP websites: www.domain1.com www.domain2.com www.domain3.com I have a separate HTTPS website www.secure.com These websites are all running on the same server. I now wish to intergrate the content of www.secure.com into each of the domains in a transparent way. Such that each website despite having its own SSL connection displays the same website. The complicatrion is www.secure.com needs to know which website the connection has come from to apply the appropriate branding. The idea behind this is to have only one website, and location, but it keeps the core website brand. https://domain1.com looks alot better from a marketing point of view (and avoids users getting confused about what our secure website is) SSL www.domain1.com/secure - displays www.secure.com (branded domain1) SSL www.domain2.com/secure - displays www.secure.com (branded domain2) SSL www.domain3.com/secure - displays www.secure.com (branded domain3) How would the best way of achieving this, i'm open to using additional software if necessery. Would a reverse proxy be sutible for this situation?

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• Mysterious Windows 7 slowdown problem

  - by cletus

  I have a fairly beefy machine: Intel Q9450 8GB DDR2800 (4x2) Intel X25-M G2 80GB SSD Several other hard drives Windows 7 Ultimate 64 In the last month I've gotten a mysterious slowdown problem. When I start my IDE (IntelliJ IDEA) it usually takes about 20 seconds on the SSD. If my machine has been on for a day or two (as far as I can tell this is the only pattern) and I try to start the IDE, it brings my machine to a halt. CPU usage goes up to 25% per core (so it's basically 100% usage) and it takes up to 5 minutes to start. Other things I've noticed: iTunes will start to skip and stutter (my music is running off a second hard drive). The only persistent things I'm running are: AVG Anti-Virus Spybot (the slowdown predates this) Hamachi and Murmur (again the slowdown predates this) Apple Airport Base Agent HP OfficeJet 8500 driver/manager The browser I use is Chrome. I can't think why that'd be relevant but it's always on so I thought I'd mention it. When this happens I can't see a reason for it in the process list. No CPU hogs. No spikes in IO activity that I can see. Basically I'm at a loss to explain it and need to reboot, at which point everything returns to normal (for awhile). FWIW the Intel SSD is about 75-80% full. I know being too full can really degrade performance. I don't believe that's the issue here. Does anyone have any ideas on what I can do to fix this or at least help find what's going wrong? This same machine (sans SSD) could run Win XP and stay up fine for a month or two.

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• 100% CPU load on Ubuntu 10.04.3 LTS 64bit

  - by deadtired

  I have 2 days since I am trying to fix this issue, with no success. The server is a mysql database server. Hardware: DELL Poweredge 1950, 2x Intel Xeon Quad Core E5345 @ 2.33GHz, 16 Gb mem, 2x 146Gb SAS (software RAID1) Software: Ubuntu 10.04.3 LTS, MySQL 5.1.41 Issue: while mysql is not used and runs with no database, everything seems alright. As soon as I install a database, it has the reason to bring all 8 cores in 100% with low memory consumption. So, you can imagine the load average goes high (I saw 212 load average for the first time). The server doesn't become unresponsive, but you can see it's slow while browsing the project installed. Additional info: the database used is not more than 24MB and it was moved from a server with less resources and a lot more larger databases. So it's not the database/project. my.cnf is not a reason also, as I used both default one and the one I use on the same distribution on another server.What is interesting is that mysql doesn't close any process and runs to the limit of the max_connections. Logs are quiet. Nothing there. I switched to this Ubuntu version after I suspected some problems in the newly Ubuntu 11.10 server. This one worked alright for an hour after I made a kernel upgrade to 3.0.1 (it was using the memory also) I tested disk speed and seems alright. Some more output on the running server: dstat -cndymlp -N total -D total 3: htop command: Idea? Did anyone meet the same problem? Any fix you can think of?

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• Error compiling PHP 5.5.9 on CentOS 6.5 during make command

  - by Chris Mancini

  Here is the error message: cc: internal compiler error: Killed (program cc1) Please submit a full bug report, with preprocessed source if appropriate. See <file:///usr/share/doc/gcc-4.6/README.Bugs> for instructions. make: *** [ext/fileinfo/libmagic/apprentice.lo] Error 1 The very last thing make was processing is apprentice.lo which appears to be part of the image manipulation libraries (maybe?). I am using Ansible to provision my instance. It is a Digital Ocean single core 512MB VM. I have been using vagrant / ansible with the same config locally for dev and it has compiled fine, this is the first cloud VM I am attempting to provision. The only difference is the base image for my DO server is coming from DO and for my local dev, I built my own Vagrant box via VirtualBox from a stock CentOS basic server install. I pull it down from my DropBox. The problem has been experienced by others and reported as a php bug report My php ansible role up to the error: --- - name: Download php source get_url: url={{ php_source_url }} dest=/tmp register: get_url_result - name: untar the source package command: tar -xvf php-{{ php_version }}.tar.gz chdir=/tmp when: get_url_result.changed or php_reinstall - name: configure php 5.5 command: > ./configure --prefix={{ php_prefix }} --with-config-file-path={{ php_config_file_path }} --enable-fpm --enable-ftp --enable-mbstring --enable-pdo --enable-soap --enable-sockets=shared --enable-zip --with-curl --with-fpm-group={{ nginx_group }} --with-fpm-user={{ nginx_user }} --with-freetype-dir=/usr/lib64/ --with-gd --with-jpeg-dir=/usr/lib64/ --with-libdir=lib64 --with-mcrypt --with-openssl --with-pdo-mysql --with-pear --with-readline --with-tidy --with-xsl --with-zlib --without-pdo-sqlite --without-sqlite3 chdir=/tmp/php-{{ php_version }} when: get_url_result.changed or php_reinstall - name: make clean when reinstalling command: make clean chdir=/tmp/php-{{ php_version }} when: php_reinstall - name: make php command: make chdir=/tmp/php-{{ php_version }} when: get_url_result.changed or php_reinstall Thanks in advance for any help. :)

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• SQLSTATE[HY000]: General error: 2006 MySQL server has gone away

  - by Barkat Ullah

  Server details: RAM: 16GB HDD: 1000GB OS: Linux 2.6.32-220.7.1.el6.x86_64 Processor: 6 Core Please see the link below for my # top preview: I can often see the error mentioned in title in my plesk panel and my /etc/my.cnf configuration are as below: bind-address=127.0.0.1 local-infile=0 datadir=/var/lib/mysql socket=/var/lib/mysql/mysql.sock user=mysql max_connections=20000 max_user_connections=20000 key_buffer_size=512M join_buffer_size=4M read_buffer_size=4M read_rnd_buffer_size=512M sort_buffer_size=8M wait_timeout=300 interactive_timeout=300 connect_timeout=300 tmp_table_size=8M thread_concurrency=12 concurrent_insert=2 query_cache_limit=64M query_cache_size=128M query_cache_type=2 transaction_alloc_block_size=8192 max_allowed_packet=512M [mysqldump] quick max_allowed_packet=512M [myisamchk] key_buffer_size=128M sort_buffer_size=128M read_buffer_size=32M write_buffer_size=32M [mysqlhotcopy] interactive-timeout [mysqld_safe] log-error=/var/log/mysqld.log pid-file=/var/run/mysqld/mysqld.pid open_files_limit=8192 As my server httpd conf is set to /etc/httpd/conf.d/swtune.conf and the configuration is as below: at prefork.c: <IfModule prefork.c> StartServers 8 MinSpareServers 10 MaxSpareServers 20 ServerLimit 1536 MaxClients 1536 MaxRequestsPerChild 4000 </IfModule> If I run grep -i maxclient /var/log/httpd/error_log then I can see everyday this error: [root@u16170254 ~]# grep -i maxclient /var/log/httpd/error_log [Sun Apr 15 07:26:03 2012] [error] server reached MaxClients setting, consider raising the MaxClients setting [Mon Apr 16 06:09:22 2012] [error] server reached MaxClients setting, consider raising the MaxClients setting I tried to explain everything that I changed to keep my server okay, but maximum time my server is down. Please help me which parameter can I change to keep my server okay and my sites can load fast. It is taking too much time to load my sites.

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• Kindly guide me to buy a new laptop [on hold]

  - by Its me 007

  I am from India. I want to buy a new laptop. Shortlisted few but confused between which processor,Chip set and Graphics will be the best suited for my requirements. NOTE: NOT ABLE TO POST THE LINKS YOU WILL HAVE TO COPY PASTE IT. SORRY. 1) HP Pavilion 15-N004TX - 4th Gen CI5 - 4200U/4GB RAM/500 GB HDD/ 1GB Radeon Graphic - Rs 39990 www.homeshop18.com/hp-pavilion-15-n004tx-laptop-4th-gen-intel-core-i5-4200u-4gb-500gb-15-6-linux-silver-black/computers-tablets/laptops/product:30989197/cid:16317/ 2) Lenovo Essential G510 (59-398452) - 4th Gen Ci5 4200M/ 4GB/ 500 GB/Win8/2GB Graph ATI Sunpro 8570 - Rs 44969 www.flipkart.com/lenovo-essential-g510-59-398452-laptop-4th-gen-ci5-4gb-500gb-win8-2gb-graph/p/itmdp26eprwf5k5v?gclid=CMnh99GA2LoCFaRU4godNiUAGQ&semcmpid=sem_7847244212_laptopsnew_goog&tgi=sem%2C1%2CG%2C7847244212%2Cg%2Csearch%2C%2C24387103114%2C1t1%2Cb%2C%2Blenovo+%2Bg510%2F59+%2B398452%2Cc%2C%2C%2C%2C%2C%2C%2C2 3) HP Pavilion G6-2303TX Laptop (3rd Gen Ci5 3230M/ 4GB/ 500GB/ DOS/ 1GB Graph) - Rs 40500 www.flipkart.com/hp-pavilion-g6-2303tx-laptop-3rd-gen-ci5-4gb-500gb-dos-1gb-graph/p/itmdm6yzh4gr4cxd?pid=COMDM6YHWMGDRDEZ&ref=1d2b85fc-a03d-4c7d-844b-ec9e8dc95a81 4) HP Pavilion 15-E039TX Laptop (3rd Gen Ci5 3230M/ 4GB/ 1TB/ Win8/ 2GB Graph) - Rs 46690 www.flipkart.com/hp-pavilion-15-e039tx-laptop-3rd-gen-ci5-4gb-1tb-win8-2gb-graph/p/itmdn4d9wykhdcpz?pid=COMDN4CZGFMGJNTN&ref=1d2b85fc-a03d-4c7d-844b-ec9e8dc95a81 Now I am confused between: Which Processor and chipset is best? How much graphic card is enough? (Not a gamer) Is any of this laptop future proof i.e. it should at least support upcoming latest programming softwares which eats more processor and memory. Laptop will be mainly used for multiprocessing.It should be at least capable for following: Visual Studio 2012 and the upcoming versions for at least 4 years SQL server 2008 R2 and above Sharepoint Blend Photoshop Kindly suggest. If anyone know any good laptop with good configuration in the 50k budget kindly suggest. Thanks in advance.

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• Trouble with nginx and serving from multiple directories under the same domain

  - by Phase

  I have nginx setup to serve from /usr/share/nginx/html, and it does this fine. I also want to add it to serve from /home/user/public_html/map on the same domain. So: my.domain.com would get you the files in /usr/share/nginx/html my.domain.com/map would get you the files in /home/user/public_html/map With the below configuration (/etc/nginx/nginx.conf) it appears to be going to my.domain.com/map/map as noticed by this: 2011/03/12 09:50:26 [error] 2626#0: *254 "/home/user/public_html/map/map/index.html" is forbidden (13: Permission denied), client: <edited ip address>, server: _, request: "GET /map/ HTTP/1.1", host: "<edited>" I've tried a few things but I'm still not able to get it to cooperate, so any help would be greatly appreciated. ####################################################################### # # This is the main Nginx configuration file. # ####################################################################### #---------------------------------------------------------------------- # Main Module - directives that cover basic functionality #---------------------------------------------------------------------- user nginx; worker_processes 1; error_log /var/log/nginx/error.log; pid /var/run/nginx.pid; #---------------------------------------------------------------------- # Events Module #---------------------------------------------------------------------- events { worker_connections 1024; } #---------------------------------------------------------------------- # HTTP Core Module #---------------------------------------------------------------------- http { include /etc/nginx/mime.types; default_type application/octet-stream; log_format main '$remote_addr - $remote_user [$time_local] "$request" ' '$status $body_bytes_sent "$http_referer" ' '"$http_user_agent" "$http_x_forwarded_for"'; access_log /var/log/nginx/access.log main; sendfile on; keepalive_timeout 65; server { listen 80; server_name _; #access_log logs/host.access.log main; location / { root /usr/share/nginx/html; index index.html index.htm; } location /map { root /home/user/public_html/map; index index.html index.htm; } error_page 404 /404.html; location = /404.html { root /usr/share/nginx/html; } error_page 500 502 503 504 /50x.html; location = /50x.html { root /usr/share/nginx/html; } } include /etc/nginx/conf.d/*.conf; }

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• VLAN ACLs and when to go Layer 3

  - by wuckachucka

  I want to: a) segment several departments into VLANs with the hopes of restricting access between them completely (Sales never needs to talk to Support's workstations or printers and vice-versa) or b) certain IP addresses and TCP/UDP ports across VLANS -- i.e. permitting the Sales VLAN to access the CRM Web Server in the Server VLAN on port 443 only. Port-wise, I'll need a 48-port switch and another 24-port switch to go with the two existing 24-port Layer 2 switches (Linksys); I'm looking at going with D-Links or HP Procurves as Cisco is out of our price range. Question #1: From what I understand (and please correct me if I'm wrong), if the Servers (VLAN10) and Sales (VLAN20) are all on the same 48-port switch (or two stacked 24-port switches), afaik, the switch "knows" what VLANs and ports each device belongs to and will switch packets between them; I can also apply ACLs to restrict access between VLANs at this point. Is this correct? Question #2: Now lets say that Support (VLAN30) is on a different switch (one of the Linksys) switches. I'm assuming I'll need to trunk (tag) switch #2's VLANs across to switch #1, so switch #1 sees switch #2's VLAN30 (and vice-versa). Once Switch #1 can "see" VLAN30, I'm assuming I can then apply ACLs as stated in Question #1. Is this correct? Question #3: Once Switch #1 can see all the VLANs, can I achieve the seemingly "Layer 3" ACL filtering of restricting access to Server VLAN on only certain TCP/UDP ports and IP addresses (say, only permitting 3389 to the Terminal Server, 192.168.10.4/32). I say "seemingly" because some of the Layer 2 switches mention the ability to restrict ports and IP addresses through the ACLs; I (perhaps mistakenly) thought that in order to have Layer 3 ACLs (packet filtering), I'd need to have at least one Layer 3 switch acting as a core router. If my assumptions are incorrect, at which point do you need a Layer 3 switch for inter-VLAN routing vs. inter-VLAN switching? Is it generally only when you need that higher-level packet filtering ability between your departments?

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• Where is my problem? The P6X58D Premium Mobo, Windows 7, or other?

  - by Dylan Yaga

  I was having problems with my USB devices for an hour last night, and I am unable to determine the root cause of the problem. The two symptoms are: At seemingly random times (not consistently spaced by time or caused by any detectable event) my USB devices become "detached". Windows will play the USB disconnect sound and then the reconnect sound. The devices disconnected and then reconnected. My USB Keyboard will "stick" on one key for several seconds before processing any other keystroke made. The mouse also does not respond to clicks. I do not lose mouse movement or USB device connectivity. And after a moment of this several beeps will be emitted from the speakers. Hardware Specs: GFX Card: EVGA GeForce GTX 470 Superclocked 1280MB DDR5 PCIe Motherboard: ASUS P6X58D Premium Intel X58 Socket LGA1366 MB Processor: Intel Core i7-920 2.66Ghz 8M LGA1366 CPU Memory: Corsair Dominator 6144MB PC12800 DDR3 Storage: Hitachi 1TB Serial ATA HD 1600MHz 7200/32MB/SATA-3G Cooling: Corsair Hydro H50 CPU Liquid Cooler Case: Corsair Obsidian 800D Full Tower Case Power Supply: Corsair HX1000W 1000W Modular Power Supply Steps I have taken to narrow down the problem: Restarted the computer. - No change Changed USB port the Hub was connected to on the CPU. - No change Removed all devices from USB Hub and connected directly to CPU. - No change Used a different USB keyboard both in USB Hub and directly to CPU. - No change Disconnected and reconnected all cables. - No change Disassembled the Tower and determined if the USB headers were firmly connected. - No change Checked device manager for errors. Checked all USB devices. - Nothing flagged After an hour of frustration trying to narrow down the problem it appeared to disappear. But I am torn between it being a Mobo problem or an OS problem. Is there anything else I can do to narrow down the problem before a reformat and then eventually exchanging the Mobo?

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• Intermittent extrememly long response times when downloading documents

  - by pap

  I have a Java web application running om Tomcat 7 with an Apache httpd 2.2 fronting with mod_jk/AJP. One part of the application is serving files (up to 4mb size). Now, normally this all runs very smooth with stable, low response-times. However, in rare instances (<0.1% of downloads), the downloadtime will go beyond 1 minute. After activating the ThreadStuckValve in Tomcat, I can see that the long responses seem to be stuck at org.apache.tomcat.jni.Socket.sendbb(Native method) i.e network I/O. At most, these long-running downloads take 5 minutes, which I strongly suspect is because of the default 300 second timout in Apache 2.2 (http://httpd.apache.org/docs/2.2/mod/core.html, "TimeOut directive"). To me, this looks like network problems. The Apache timeout (if that is what is kicking in at the 5 minute mark) indicates that ACK packets are not being transmitted correctly. My questions are what could be causing this? Closed browser at receiving end but socket not signaled as closed properly? Packet loss or some other network failure in transit? Where would I start troubleshooting this? We're running Tomcat and Apache on Windows server 2008-R2 in a vmware virtualized server.

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• Very Slow DSL (ethernet) speed

  - by Abhijit

  I 'was' on opensuse 12.2 when my dsl speed was normal. Yesterday I switched from opensuse to ubuntu 12.04 and speed decreased. It came to range of 7-10-13-20-25-kbps. Then I switch to linux mint, and then to fedora. Still slow speed. When I was in ubuntu I disabled ipv6 but still no luck. Now I am in fedora but this time with DIFFERENT ISP. And still I am getting very slow sped. So my guess is this is nothing to do with os. What can be wrong? Is this problem of NIC? Does NIC speed decreases over time? Does NIC life ends over time as with keyboard or mouse? Help please All the os I used are 64 bit and my laptop is Compaq Presario A965Tu Intel Centrino DUal Core. Interesting thing to notice is I get normal speed while downloading torrent inside torrent client softwares. This slow speed issue applied to download from any web browser or installing software using terminal.

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• High latency due to non-presence of a transit provider in my country

  - by nixnotwin

  My ISP, a state owned incumbent, buys bandwidth from different transit providers. Whenever it buys transits it announces only a specific prefix (in most cases a hitherto unused) through the new transit AS. For e.g. if it runs out of bandwidth, it buys bandwidth from a new transit and announces a new prefix through it, while the same prefix is not announced (or announced with lowest metrics, so that the routes are very rarely used) via the old transits which continue to provide bandwidth to it. I am a business customer, so I have a fiber based link to the ISP and a tiny subnet is given to me. The subnet which is provide to me is part of a prefix which is announced by the AS of a transit who, it seems, do not have a presence in my country. So when I do a trace the packets, when they leave my ISP's AS, they take about 275ms to reach the transit providers core router, which is located in USA (half the world away). Also for upstream traffic my ISP uses a transit provider (tier 1) who has a presence in my country. But the return path is always through the transit which is in USA. So, average latency is 400ms. All the users of other ISPs in my country discover my subnet via USA. Even the traffic from neighboring countries, from Europe (which is much nearer) follows the path via USA. Sites using CDNs also resolve to ips in USA. I have informed the ISP NOC about the issue and I have asked them to provide an ip subnet belonging to a prefix announced by a local transit (preferably a tier 1 transit provider) and I am waiting for a reply. My question: Is it a serious issue that I must follow up to get it resolved? When I compared the latency on other providers in my country, it is, in most cases, less than half of my ISPs latency. Why my ISP doesn't announce all its prefixes to all of its transit providers, so that the packets can take efficient and nearest routes to reach prefixes that originate within its network?

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• Very high-pitched noise when computer does something intense?

  - by Starkers

  "Intense" is the best word I can use to describe it because I'm not sure what it is, whether it's RAM, GPU or CPU. If I pan the camera in unity: A high pitched noise issues from the computer. The picosecond I start panning the sound starts. Stops the picosecond I stop panning. If I start an infinite loop: 2.0.0p247 :016 > x = 1 => 1 2.0.0p247 :017 > while x < 2 do 2.0.0p247 :018 > puts 'huzzah!' 2.0.0p247 :019?> end huzzah! huzzah! huzzah! An identical high pitched noise can be heard. I don't think it's the GPU due to this simple experiment. Or any monitor-weirdness (although the sound does sound like one of those old CRT monitors if you're old enough to be young when those things were about) The CPU? Or maybe my SSD? It's my first SSD and the first time I've heard this noise. Should I be worried? Regardless, what's causing this sound? I can't think what would cause such high frequency vibrations. I built the PC myself. Not enough heat paste on the CPU? Too much? Just no idea what's going on. Info: CPU Type QuadCore Intel Core i5-3570K, 3800 MHz (38 x 100) Motherboard Name Asus Maximus V Extreme Flash Memory Type Samsung 21nm TLC NAND Video Adapter Asus HD7770

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• Is it possible for a faulty processor to cause audio static/noise?

  - by Tom

  I have a Core 2 Extreme processor I received from a friend and have set up an XBMC box using it. However, I constantly get audio static whenever playing any music or videos. Here is a video of the sound: http://www.youtube.com/watch?v=SqKQkxYRVA4 I have tried replacing everything short of the case and the processor, including cables, audio interfaces, operating systems, ram, etc, leading me to think it might be either the case shorting out the motherboards I have tried or a faulty processor. Is it possible for a faulty processor to cause audio static/noise? Any feedback would be appreciated. Edit - Here's a list of things I have tried: Reinstalling OS Installing/upgrading/repairing PulseAudio/Alsa Installing alternate OSes, straight Ubuntu, Lubuntu, Xubuntu, Arch, Mint, Windows 7 Switching audio from the external card to internal Optical, audio out through HDMI, audio out through headphones Different ports on receiver (my main desktop sounds fine on the same sound system) Different optical cables Unplugging everything unnecessary from the motherboard (1 HD, 1 Stick of Ram, 1 Keyboard) Swapping out ram Swapping out the motherboard Replacing the Graphics Card (was replaced due to fan being noisy, not specifically for this problem) Different harddrives Swapping power supply Disabling onboard audio Switching Power Cable Plugging in through surge protector Plugging into different outlet on separate circuit

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• HP DL185 - very slow disk read speed

  - by fistameeny

  Hi, I have a HP DL185 G6 Server (12 disk model) with the following spec: Quad Core Xeon 2.27GHz 6GB RAM HP P212 RAID controller with battery backup 2 x 128GB 15K SAS 3.5" (RAID-1 for the operating system) 4 x 750GB 7.5K SAS 3.5" (RAID-5 for the data, 2TB usable space) The operating system is Ubuntu Server 9.10. Both drives have been formatted as EXT4. We are finding that read speed of the RAID-5 array is poor. Disk test results below: sudo hdparm -tT /dev/cciss/c0d1p1 /dev/cciss/c0d1p1: Timing cached reads: 15284 MB in 2.00 seconds = 7650.18 MB/sec Timing buffered disk reads: 74 MB in 3.02 seconds = 24.53 MB/sec For info, the RAID-1 array performs as follows: sudo hdparm -tT /dev/cciss/c0d0p1 /dev/cciss/c0d0p1: Timing cached reads: 15652 MB in 2.00 seconds = 7834.26 MB/sec Timing buffered disk reads: 492 MB in 3.01 seconds = 163.46 MB/sec We thought this was because with no battery, read/write cache is disabled. We have bought and installed the battery backup and have used the HP bootable CD to change the cache settings to 50% read / 50% write and check cache is enabled on the drives and the controller. Is there something I'm missing?

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• Difference between CurrentClockSpeed and MaxClockSpeed

  - by Ben

  Rationale this belongs on ServerFault rather than StackOverflow - I already have my program which gets the value, I am querying the value returned and what it means. I have an in-house program which audits our company PCs, and one of the things it checks is the speed of the processor. To do this, it queries the Win32_Processor WMI class and gets the value of CurrentClockSpeed. We were playing with the data today and found an anomaly with some of the speeds being reported incorrectly (for example, CurrentClockSpeed said 1.0GHz, whereas the CPU name said Intel(R) Core(TM)2 CPU T5600 @ 1.83GHz [Confirmed it is in fact 1.83GHz]). I did a bit of digging on the internet and found this blog post which might explain what is going on. My initial thought was that I could change the program to instead get the value for MaxClockSpeed instead of CurrentClockSpeed, but Microsoft's documentation doesn't clearly define what this will return. What I mean by that is will this return a value which is its actual maximum speed (say if it were overclocked) but which it would not normally be running at, or would it return what I expect, which is its maximum speed under normal (not overclocked) conditions?

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• Desktop Provisioning for a Small Linux Software Development Team

  - by deakblue

  Goal: Get a small team using a standard development image rather than 4 software devs setting up their own environments. Why: it takes a day or days to install a distro, build-specific libraries, tools like editors and IDEs, mysql, couchdb, java, maven, python, android-sdk, etc. It's a giant PITA that when repeated 4 times by 4 developers (not sys admins) wastes time and generates annoying divergences that crop up later (it-builds-on-my-box syndrome). There's no sharing of productivity, settings, tricks, scripts, set-ups. Some of this is helped by segregating the build systems into headless virtualbox images. This doesn't really address tooling though or the GUI-desktop dev that needs doing. So I see three basic strategies, ghosting, virtualization, and finally creating a kind of in-house linux distro (I guess Google does something like this). The target dev environment is based on Debian OpenBox and must allow a mix of 3rd gen Core i7 notebooks 8GB-minimum to work both single and multihead. Important, the lappies are not the same, but a mix of 2012 macbooks and PCs. So: virtualization: is doing all of your work within a VM, like VirtualBox, practical on this hardware or annoying. ghosting: will laptops from different manufacturers make this impractical. DIY distro: short of scripting a bunch of package installs, I don't know if there's any "distro-maker" that could keep this from being an epic project of scripting package installs. So any advice?

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• Windows Server 2008 R2 running at a snail's pace

  - by Django Reinhardt

  Really weird problem here. Our main web server has started running at a snail's pace, for absolutely no reason we can discern. Even after restarting the machine, when there's no little or no ram usage and CPU usage is fluctuating between 0 and 30%, simple tasks, like opening Internet Explorer, or waiting for My Computer to open, take forever. There are no processes hogging system resources that we can see... the machine itself is just exhibiting extremely slow behaviour. I've never seen a machine do this. A lot of security updates had built up, so we decided to let Windows install them. When we looked through the history upon restarting, though, they had failed with error code 800706BA. I don't know if this could be related or not. Any help in this matter would be greatly appreciated. As mentioned in the title, we're running a Windows Server 2008 R2 machine. It's also running SQL Server and IIS. It has 16GB of RAM and a decent Quad Core processor. It's also been fine until now -- and we haven't changed a thing. Thanks for any help.

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• Windows is very slow with my new SSD

  - by Maksym H.

  I have a laptop HP probook 4520s with Core i5 M480 @ 2.67Ghz, 4Gb RAM, 640 GB HDD Radeon HD 6370m 1GB video card. It would seem like a good stack for work, right? But My HDD has crashed after everyday walking with laptop about 1 year. After buying my new SSD (Patriot memory - Torqx II 128 Gb SATA II) and installing new Windows 8 from scratch - it was amazing fast. But I had only install windows updates, and I feel that the speed become the same as my old HDD, after install other software for my work, it becomes so slow, so when I use my PC with old lower configuration and it really works better than my awesome laptop... I checked that TRIM and AHCI mode are turned on. So why's that? I asked for help in Patriot Memory support, they suggested to send them ATTO test results, done, sent. Here is the response: "Thank you very much for the attached results. Looking at the results, I can see that your SSD speed is a lot lower than it should be. Can you tell me your system specs?" Until they checked my email, I re-installed Windows 8 to Windows 7 and it was again perfect, but the story repeats it becomes slower and slower after every installing new software. Check out some screenshots.. (sorry for the screenshot with russian TaskManager, I hope you will recognize those parameters accordingly with your english or other lang TaskManager) So the main issue that something everytime loads the disc on 100% and the response time is jumping around 1000-3000 ms. Why am I asking about Windows? Because I tried to install Linux Mint (x86) and It just flies. So great performance independent on how many programs I have installed. Only Windows (any 7 or 8) has this problem. So guys, I appreciate any ideas about how to fix that and may be answers of main question - "why is it so.?" Thanks!

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• Debian Bluetooth headphones not working

  - by cYrus

  Hardware Headphones Bluetooth dongle Maybe not exactly these models. Setup I tried to follow some guides, here's what I've done so far: Install software: sudo apt-get install bluez-utils bluez-alsa Reboot (just to be sure): $ dmesg | grep -i bluetooth [ 20.268212] Bluetooth: Core ver 2.16 [ 20.268230] Bluetooth: HCI device and connection manager initialized [ 20.268233] Bluetooth: HCI socket layer initialized [ 20.268235] Bluetooth: L2CAP socket layer initialized [ 20.268239] Bluetooth: SCO socket layer initialized [ 20.284685] Bluetooth: RFCOMM TTY layer initialized [ 20.284692] Bluetooth: RFCOMM socket layer initialized [ 20.284693] Bluetooth: RFCOMM ver 1.11 [ 20.335375] Bluetooth: BNEP (Ethernet Emulation) ver 1.3 [ 20.335378] Bluetooth: BNEP filters: protocol multicast The deamon is running: $ /etc/init.d/bluetooth status [ ok ] bluetooth is running. Plug the dongle: $ dmesg | tail [...] [23108.352034] usb 5-2: new full-speed USB device number 2 using ohci_hcd [23108.571131] usb 5-2: New USB device found, idVendor=0a12, idProduct=0001 [23108.571136] usb 5-2: New USB device strings: Mfr=0, Product=0, SerialNumber=0 [23108.629042] usbcore: registered new interface driver btusb Put the headphones in pairing mode, and try scanning: $ hcitool scan Scanning ... Found nothing. What's next? What should I try? I'll update this answer as soon as you provide me hints.

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• Faking a Linux environment without chroot

  - by Pascal

  For a university project I want to test a C++11 program on a 32-core machine. Unfortunately the machine has Ubuntu 12.04 with GCC 4.6 installed (we need GCC 4.7 because of some C++11 threading features). In such an environment I would normally run a chroot with a custom linux (say a debootstrap with Ubuntu 12.10). Since we don't get root access on the machine we can't use chroot. So far I have prepared a run-time environment using debootstrap for our code, I compiled it in the debootstrap environemnt. Then copied it onto the server (using rsync). In order to run our C++ code I set the LD_LIBRARY_PATH to export LD_LIBRARY_PATH=~/debootstrap/usr/lib/:~/debootstrap/lib64/:~/debootstrap/usr/lib/x86_64-linux-gnu/:~/debootstrap/lib/x86_64-linux-gnu/:$LD_LIBRARY_PATH and so far our code seems to run. I'm however stuck with our python code. It doesn't seem to be sufficient to set the paths manually. export PYTHONPATH=~/debootstrap/usr/lib/python2.7/dist-packages:~/debootstrap/usr/lib/python2.7:~/debootstrap/usr/lib/python2.7/plat-linux2:~/debootstrap/usr/lib/python2.7/lib-tk:~/debootstrap/usr/lib/python2.7/lib-dynload:~/debootstrap/usr/local/lib/python2.7/dist-packages:~/debootstrap/usr/lib/pymodules/python2.7:~/debootstrap/usr/lib/python2.7/dist-packages/PIL:~/debootstrap/usr/lib/python2.7/dist-packages/gtk-2.0:~/debootstrap/usr/lib/python2.7 Executing our script results in ImportError: No module named _path Is there an easier way to accomplish a "fake"-chroot than just overriding and creating environment variables? Note I need python since we created a custom C++-Python module in order to run our tests. Maybe I should create two questions from this.

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• Server Recovery from Denial of Service

  - by JMC

  I'm looking at a server that might be misconfigured to handle Denial of Service. The database was knocked offline after the attack, and was unable to restart itself after it failed to restart when the attack subsided. Details of the Attack: The Attacker either intentionally or unintentionally sent 1000's of search queries using the applications search query url within a couple of seconds. It looks like the server was overwhelmed and it caused the database to log this message: Server Specs: 1.5GB of dedicated memory Are there any obvious mis-configurations here that I'm missing? **mysql.log** 121118 20:28:54 mysqld_safe Number of processes running now: 0 121118 20:28:54 mysqld_safe mysqld restarted 121118 20:28:55 [Warning] option 'slow_query_log': boolean value '/var/log/mysqld.slow.log' wasn't recognized. Set to OFF. 121118 20:28:55 [Note] Plugin 'FEDERATED' is disabled. 121118 20:28:55 InnoDB: The InnoDB memory heap is disabled 121118 20:28:55 InnoDB: Mutexes and rw_locks use GCC atomic builtins 121118 20:28:55 InnoDB: Compressed tables use zlib 1.2.3 121118 20:28:55 InnoDB: Using Linux native AIO 121118 20:28:55 InnoDB: Initializing buffer pool, size = 512.0M InnoDB: mmap(549453824 bytes) failed; errno 12 121118 20:28:55 InnoDB: Completed initialization of buffer pool 121118 20:28:55 InnoDB: Fatal error: cannot allocate memory for the buffer pool 121118 20:28:55 [ERROR] Plugin 'InnoDB' init function returned error. 121118 20:28:55 [ERROR] Plugin 'InnoDB' registration as a STORAGE ENGINE failed. 121118 20:28:55 [ERROR] Unknown/unsupported storage engine: InnoDB 121118 20:28:55 [ERROR] Aborting **ulimit -a** core file size (blocks, -c) 0 data seg size (kbytes, -d) unlimited scheduling priority (-e) 0 file size (blocks, -f) unlimited pending signals (-i) 13089 max locked memory (kbytes, -l) 64 max memory size (kbytes, -m) unlimited open files (-n) 1024 pipe size (512 bytes, -p) 8 POSIX message queues (bytes, -q) 819200 real-time priority (-r) 0 stack size (kbytes, -s) 8192 cpu time (seconds, -t) unlimited max user processes (-u) 1024 virtual memory (kbytes, -v) unlimited file locks (-x) unlimited **httpd.conf** StartServers 10 MinSpareServers 8 MaxSpareServers 12 ServerLimit 256 MaxClients 256 MaxRequestsPerChild 4000 **my.cnf** innodb_buffer_pool_size=512M # Increase Innodb Thread Concurrency = 2 * [numberofCPUs] + 2 innodb_thread_concurrency=4 # Set Table Cache table_cache=512 # Set Query Cache_Size query_cache_size=64M query_cache_limit=2M # A sort buffer is used for optimizing sorting sort_buffer_size=8M # Log slow queries slow_query_log=/var/log/mysqld.slow.log long_query_time=2 #performance_tweak join_buffer_size=2M **php.ini** memory_limit = 128M post_max_size = 8M

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