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MySQL is killing the server IO.

- by OneOfOne

I manage a fairly large/busy vBulletin forums (running on gigenet cloud), the database is ~ 10 GB (~9 milion posts, ~60 queries per second), lately MySQL have been grinding the disk like there's no tomorrow according to iotop and slowing the site. The last idea I can think of is using replication, but I'm not sure how much that would help and worried about database sync. I'm out of ideas, any tips on how to improve the situation would be highly appreciated. Specs : Debian Lenny 64bit ~12Ghz (6 cores) CPU, 7520gb RAM, 160gb disk. Kernel : 2.6.32-4-amd64 mysqld Ver 5.1.54-0.dotdeb.0 for debian-linux-gnu on x86_64 ((Debian)) Other software: vBulletin 3.8.4 memcached 1.2.2 PHP 5.3.5-0.dotdeb.0 (fpm-fcgi) (built: Jan 7 2011 00:07:27) lighttpd/1.4.28 (ssl) - a light and fast webserver PHP and vBulletin are configured to use memcached. MySQL Settings : [mysqld] key_buffer = 128M max_allowed_packet = 16M thread_cache_size = 8 myisam-recover = BACKUP max_connections = 1024 query_cache_limit = 2M query_cache_size = 128M expire_logs_days = 10 max_binlog_size = 100M key_buffer_size = 128M join_buffer_size = 8M tmp_table_size = 16M max_heap_table_size = 16M table_cache = 96 Other : > vmstat procs -----------memory---------- ---swap-- -----io---- -system-- ----cpu---- r b swpd free buff cache si so bi bo in cs us sy id wa 9 0 73140 36336 8968 1859160 0 0 42 15 3 2 6 1 89 5 > /etc/init.d/mysql status Threads: 49 Questions: 252139 Slow queries: 164 Opens: 53573 Flush tables: 1 Open tables: 337 Queries per second avg: 61.302. Edit Additional info.

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Apache reverse proxy with VirtualHost not serving a page

- by Mr Aleph

I have an Apache reverse proxy set to move requests to a Tomcat Applet. The config is similar to: <VirtualHost 100.100.100.100:80> ProxyPass /AppName/App http://1.1.1.1/AppName/App ProxyPassReverse /AppName/App http://1.1.1.1/AppName/App </VirtualHost> I also have a page called summary.html that exists on 1.1.1.1 as: http://1.1.1.1/AppName/summary.html When I browse directly to it I have no problem viewing it, however if I try to get there via the reverse proxy I get a blank page. Wireshark shows me a 503, but this one is coming from the Apache reverse proxy (IP 100.100.100.100) and not the Tomcat (IP 1.1.1.1). Should I add http://1.1.1.1/AppName/ to the config? How? I tried it but I get a blank page, however this one shows on the URL bar of the browser the internal IP of the Tomcat, so, no go. Help is appreciated. Thanks. EDIT: This is the dump from Wireshark: GET /AppName/ HTTP/1.1 Host: 100.100.100.100 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_6_8) AppleWebKit/534.52.7 (KHTML, like Gecko) Version/5.1.2 Safari/534.52.7 Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8 Cache-Control: max-age=0 Accept-Language: en-us Accept-Encoding: gzip, deflate Connection: keep-alive HTTP/1.1 404 Not Found Date: Tue, 30 Jan 2012 09:08:51 GMT Server: Apache Content-Length: 1 Connection: close Content-Type: text/html; charset=iso-8859-1

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setup lowcost image storage server with 24x SSD array to get high IOPS?

- by Nenad

I want to build let's name it a lowcost Ra*san which would host for our social site the images (many millions) we have 5 sizes of every photo with 3 KB, 7 KB, 15 KB, 25 KB and 80 KB per Image. My idea is to build a Server with 24x consumer 240 GB SSD's in Raid 6 which will give me some 5 TB Disk space for the photo storage. To have HA I can add a 2nd one and use drdb. I'm looking to get above 150'000 IOPS (4K Random reads). As we mostly have read access only and rarely delete photos i think to go with consumer MLC SSD. I read many endurance reviews and don't see there a problem as long we don't rewrite the cells. What you think about my idea? - I'm not sure between Raid 6 or Raid 10 (more IOPS, cost SSD). - Is ext4 OK for the filesystem - Would you use 1 or 2 Raid controller, with Extender Backplane If anyone has realized something similar i would be happy to get Real World numbers. UPDATE I have buy 12 (plus some spare) OCZ Talos 480GB SAS SSD Drive's they will be placed in a 12-bay DAS and attached to a PERC H800 (1GB NV Cache, manufactured by LSI with fastpath) Controller, I plan to setup Raid 50 with ext4. If someone is wondering about some benchmarks let me know what you would like to see.

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I cannot access Windows Update at all

- by Cardinal fang

I have been unable to access the Windows update site for a couple of weeks now. I just get a message saying "Internet Explorer cannot display the webpage" and saying I have connection problems. Same thing is replicated with any other Microsoft site I try to access. The Automatic Updates also do not work. I can access every other wesbite I've surfed to. I've tried Googling the problem and based on what other site have suggested I have cleared my cache and temp files. I've scanning my hard drive with my antivirus in case I have a virus (nada). I've tried turning off my firewall and anti-virus (I run Zone Alarm). I've downloaded SpyBot and scanned my drive with that in case something was missed by Zone Alarm (again nada). Based on suggestions from the smart cookies on the Bad Science forum, I've used nslookup to check my translation isn't wonky (got all the info they said I should get). I've also tried navigating there directly using the IP address I was given (nope). I normally access the internet through a 3 mobile broadband connection, but have also tried connecting using a mate's wi-fi connection in case it was something on my mobile modem interferring. I run Windows XP SP3 with Internet Explorer 7 and Zone Alarm Internet Security Suite as my anti-virus/ firewall. Any suggestions?

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Google bots are severely affecting site performance

- by Lynn

I have an aggregate site on a linux server that pulls in feeds from a universe of about 2,000 blogs. It's in Wordpress 3.4.2 and I have a cron job that is staggered to run five times an hour on another server to pull in the stories and then publish them to the front page of this site. This is so I didn't put too much pressure all on one server. However, the Google bots, which visit a few times every hour bring the server to its knees in the morning and evenings when there is an increase in traffic on the site. The bots have something like 30,000 links to follow at this point. How do I throttle the bots to simply grab the new stories off the front page and stop there? EDIT- Details of my server configuration: The way we have this set up is the server that handles all the publishing is an unmanaged instance via AWS. It mounts the NFS server and connects to the RDS to update content, etc. You get to this publishing instance via a plugin that detects the wp-admin link and then redirects you into there. The front end app server also mounts the NFS and requests data from the RDS. It is the only one that has the WP Super Cache on it.... The OS is Ubuntu on the App server and the NFS runs CentOs. The front end is Nginx and the publishing server is Apache.

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site to listen on port 88

- by JohnMerlino

I want to get one of my sites to listen on port 88. In ports.conf in /etc/apache2 on ubuntu server, I add so web app can listen on port 88: NameVirtualHost *:80 Listen 80 NameVirtualHost *:88 Listen 88 I have this in my etc/apache2/apache2.conf, I have this: # Include the virtual host configurations: Include sites-enabled/ Under sites enabled, I have a file looks like this: Listen *:88 NameVirtualHost *:88 <VirtualHost *:88> ServerName dogtracking.com DocumentRoot /home/doggps/public_html/eaglegps.com/current/public <Directory /home/doggps/public_html/eaglegps.com/current/public> AllowOverride all Options -MultiViews </Directory> <LocationMatch "^/assets/.*$"> Header unset ETag FileETag None # RFC says only cache for 1 year ExpiresActive On ExpiresDefault "access plus 1 year" </LocationMatch> </VirtualHost> Then I try to restart apache: /etc/init.d/apache2 restart And I get: * Restarting web server apache2 /usr/sbin/apache2ctl: line 87: ulimit: open files: cannot modify limit: Operation not permitted Warning: DocumentRoot [/home/xtreme/Sites/DogGPS-CMS] does not exist apache2: Could not reliably determine the server's fully qualified domain name, using 127.0.0.1 for ServerName [Thu Oct 18 18:04:21 2012] [warn] NameVirtualHost *:88 has no VirtualHosts /usr/sbin/apache2ctl: line 87: ulimit: open files: cannot modify limit: Operation not permitted Warning: DocumentRoot [/home/xtreme/Sites/DogGPS-CMS] does not exist apache2: Could not reliably determine the server's fully qualified domain name, using 127.0.0.1 for ServerName [Thu Oct 18 18:04:22 2012] [warn] NameVirtualHost *:88 has no VirtualHosts (13)Permission denied: make_sock: could not bind to address 0.0.0.0:80 no listening sockets available, shutting down Unable to open logs Action 'start' failed.

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Disable RAID to JBOD in server IBM x3400 M2

- by BanKtsu

Hi I just wanna disable the default RAID in my server IBM System X3400 M2 Server(7837-24X),i have 3 disk drives SAS. I want to make them a JBOD "Just a Bunch Of Disks", because I want to install in the drive 0 CentOS, and the other two make them cache files for a squid server. I disable the RAID in the BIOS: System Settings/Adapters and UEFI drivers/LSI Logic Fusion MPT SAS Driver -PciRoot(0x0)/Pci(0x3,0X0)/Pci(0x0,0x0) LSI Logic MPT Setup Utility RAID Properties/Delete Array Later I boot the CentOS live CD and install the OS in the drive 0, and the others 2 mounted like this: *LVM Volume Groups vg_proxyserver 139508 lv_root 51200 / ext4 lv_home 84276 /home ext4 lv_swap 4032 Hard Drive sdb(/dev/sdb) free 140011 sdc(/dev/sdc) free 140011 sdd(/dev/sdd) sdd1 500 /boot ext4 sdd2 139512 vg_proxyserver physical volume(LVM) But when I restart the server give me the error: Boot failed Hard Disk 0 UEFI PXE PciRoot(0x0)/Pci(0x1,0X0)/Pci(0x0,0x0)/MAC(001A64B15130,0X0)) ........PXE-E18:Server response timeout. UEFI PXE PciRoot(0x0)/Pci(0x1,0X0)/Pci(0x0,0x0)/MAC(001A64B15132,0X0)) ........PXE-E18:Server response timeout. and the OS not start. The IBM force me to do a RAID?,why?

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Reduce "Metafile" memory usage?

- by Jay Conrod

My work computer (Windows 7 64-bit) spends a lot of time swapping memory when I switch between programs. This surprises me since I have 4 GB of RAM, and the programs I use aren't particularly RAM hungry (Outlook, Emacs, p4win, Firefox, various build tools). I downloaded RAMMap, and it shows over a gigabyte of memory used by "Metafile". From the Sysinternals blog: Metafile is part of the system cache and consists of NTFS metadata. NTFS metadata includes the MFT as well as the other various NTFS metadata files. ... In the MFT each file attribute record takes 1k and each file has at least one attribute record. Add to this the other NTFS metadata files and you can see why the Metafile category can grow quite large on servers with lots of files. So I understand what the "Metafile" data is... I work on large builds comprising hundreds of thousands of files (none are that big, but they add up to several gigabytes). My question is how can I reduce the amount of memory used by "Metafile"? I'm not actively using all those files at once, so why does Windows need to keep info in RAM? Restarting my machine every time I sync a new build is really annoying.

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Interruptionless Uploads / Rollback in IIS

- by NickatUship

I'm not sure if this is the right way to ask this question, but here's basically what i'd like to do: 1.) Push a changeset to a site in IIS. 2.) Don't interrupt the users. 3.) Be able to roll back effortlessly. So, there are a few things that I know have to happen: 1.) Out of Proc session - handled 2.) Out of Proc cache - handled So the questions that remain: 1.) How do i keep from interrupting the users? If i just upload the files to bin, the app recycles and takes 10+ seconds to come back online 2.) How do i roll back effortlessly? I was thinking a possible solution would be to have two sites set up in IIS, one public and one private. Uploads go to private and get warmed up. After warmup, the sites are swapped. A rollback only entails swapping to private without an upload. This seems sound in theory, but Im not sure of the mechanics. Any ideas?

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CC.NET + SVN : Server certificate issue

- by MSI

I am trying to setup Continuous Integration in our office. Being a puny little developer I am facing this supposedly infamous problem: " Source control operation failed: svn: OPTIONS of 'https://trunkURL': Server certificate verification failed: issuer is not trusted" So I tried the following solution - Run CC.NET service (server running as win service) using a domain account (rather than default LOCAL SYSTEMS) and accept cert permanently using command prompt under that user by using svn log/list on the repo. Doesn't help :(. I am getting the following from my artifact/log files(or dashboard) ThoughtWorks.CruiseControl.Core.CruiseControlException: Source control operation failed: svn: OPTIONS of 'https://TrunkURL': Server certificate verification failed: issuer is not trusted (https://ServerAdd) . Process command: E:\(svn.exe Path) log https://TrunkURL -r "{2010-11-08T02:12:20Z}:{2010-11-08T02:13:21Z}" --verbose --xml --no-auth-cache --non-interactive at ThoughtWorks.CruiseControl.Core.Sourcecontrol.ProcessSourceControl.Execute(ProcessInfo processInfo) at ThoughtWorks.CruiseControl.Core.Sourcecontrol.Svn.GetModifications(IIntegrationResult from, IIntegrationResult to) at ThoughtWorks.CruiseControl.Core.Sourcecontrol.QuietPeriod.GetModificationsWithLogging(ISourceControl sc, IIntegrationResult from, IIntegrationResult to) at ThoughtWorks.CruiseControl.Core.Sourcecontrol.QuietPeriod.GetModifications(ISourceControl sourceControl, IIntegrationResult lastBuild, IIntegrationResult thisBuild) at ThoughtWorks.CruiseControl.Core.IntegrationRunner.GetModifications(IIntegrationResult from, IIntegrationResult to) at ThoughtWorks.CruiseControl.Core.IntegrationRunner.Integrate(IntegrationRequest request) We are using VisualSVN Server and CC.NET for this adventure. Tips, suggestions will be highly appreciated. Thanks

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Use subpath internal proxy for subdomains, but redirect external clients if they ask for that subpath?

- by HostileFork

I have a VirtualHost that I'd like to have several subdomains on. (For the sake of clarity, let's say my domain is example.com and I'm just trying to get started by making foo.example.com work, and build from there.) The simplest way I found for a subdomain to work non-invasively with the framework I have was to proxy to a sub-path via mod_rewrite. Thus paths would appear in the client's URL bar as http://foo.example.com/(whatever) while they'd actually be served http://foo.example.com/foo/(whatever) under the hood. I've managed to do that inside my VirtualHost config file like this: ServerAlias *.example.com RewriteEngine on RewriteCond %{HTTP_HOST} ^foo\.example\.com [NC] # <--- RewriteCond %{REQUEST_URI} !^/foo/.*$ [NC] # AND is implicit with above RewriteRule ^/(.*)$ /foo/$1 [PT] (Note: It was surprisingly hard to find that particular working combination. Specifically, the [PT] seemed to be necessary on the RewriteRule. I could not get it to work with examples I saw elsewhere like [L] or trying just [P]. It would either not show anything or get in loops. Also some browsers seemed to cache the response pages for the bad loops once they got one... a page reload after fixing it wouldn't show it was working! Feedback welcome—in any case—if this part can be done better.) Now I'd like to make what http://foo.example.com/foo/(whatever) provides depend on who asked. If the request came from outside, I'd like the client to be permanently redirected by Apache so they get the URL http://foo.example.com/(whatever) in their browser. If it came internally from the mod_rewrite, I want the request to be handled by the web framework...which is unaware of subdomains. Is something like that possible?

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configuring lighttpd for large downloads

- by ahmedre

i run a web site that hosts pages that are just general scripts (php, etc) and mp3 downloads (some of which are fairly large - up to 200mb). i am running lighttpd on the servers on linux (ubuntu 64). everything is fine, but under high load, the server is not accessible (or very slow - even sshing in takes a while), and i am guessing this is due to a huge number of mp3 downloads at that time. consequently, dns sees the server as down and redirects all the traffic to the other servers, and after a while, it comes back up and things work again. so what's the best way to fix this? ideally, i want the server to continue running (and the web pages - php etc - to always work, but downloads don't always have to work). should i just have 2 web servers running (one for the downloads and one for the php pages), or is it perhaps something i can fix in my lighttpd configuration? here are the snippets from my configuration: server.max-worker = 4 server.max-fds = 2048 server.max-keep-alive-requests = 4 server.max-keep-alive-idle = 4 server.stat-cache-engine = "fam" fastcgi.server = ( ".php" => (( "bin-path" => "/usr/bin/php-cgi", "socket" => "/tmp/php.socket", "max-procs" => 1, "idle-timeout" => 20, "bin-environment" => ( "PHP_FCGI_CHILDREN" => "64", "PHP_FCGI_MAX_REQUESTS" => "1000" ), "bin-copy-environment" => ( "PATH", "SHELL", "USER" ), "broken-scriptfilename" => "enable" )) ) # normal php site $HTTP["host"] =~ "bar.com" { server.document-root = "/usr/local/www/sites/bar.com/" accesslog.filename = "|/usr/sbin/cronolog /var/log/lighttpd/%m/%d/%H/bar.log" } # download site $HTTP["host"] =~ "(download|stream).foo.com" { server.document-root = "/home/audio/" dir-listing.activate = "enable" dir-listing.hide-dotfiles = "enable" evasive.max-conns-per-ip = 1 evasive.silent = "enable" # connection.kbytes-per-second = 256 accesslog.filename = "|/usr/sbin/cronolog /var/log/lighttpd/%m/%d/%H/download.log" }

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Disable Certain Firefox Plugins System-wide by Default

- by Andrew Case

I have firefox installed system-wide for all our users. Unfortunately the Adobe Reader Plug-in is rather flakey and doesn't work some of the time. As a result I want to disable the plug-in by default for all our users, but still allow them to enable it if they want via the standard Tools-Add-ons-Plug-ins menu option. How can I have this plug-ins enabled/disabled status be disabled by default? I've been able to configure system-wide configurations before by setting preferences in the mozilla root folder file defaults/pref/all.js, but enabled/disabled plugins doesn't appear to be configured in the preferences. [edit 1]: I found 'How to manage firefox plugins in pluginreg.dat file' which explained some of the formatting of the pluginreg.dat file. From there I could see flags are masked as follows (from nsPluginHostImpl.h): #define NS_PLUGIN_FLAG_ENABLED 0x0001 // is this plugin enabled? #define NS_PLUGIN_FLAG_OLDSCHOOL 0x0002 // is this a pre-xpcom plugin? #define NS_PLUGIN_FLAG_FROMCACHE 0x0004 // this plugintag info was loaded from cache #define NS_PLUGIN_FLAG_UNWANTED 0x0008 // this is an unwanted plugin #define NS_PLUGIN_FLAG_BLOCKLISTED 0x0010 // this is a blocklisted plugin But is there a way to add this to the defaults so that that NS_PLUGIN_FLAG_ENABLED is removed by default?

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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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Nginx map module 301 redirecting

- by Reinier Korth

I've rebuild my website in Ruby on Rails and now I want to 301 redirect a lot of old urls using Nginx's http://wiki.nginx.org/HttpMapModule For some reason I can't get it to work. It works fine without the rewrite ^ $new permanent; line. Does anyone see what I'm missing? This my nginx.conf: server { server_name example.com; return 301 $scheme://www.example.com$request_uri; } # 301 redirect list map $uri $new { /test123 http://www.example.com/test123; /bla http://www.example.com/bladiebla; } server { server_name www.example.com; rewrite ^ $new permanent; root example/public; location ^~ /assets/ { gzip_static on; expires max; add_header Cache-Control public; } try_files $uri/index.html $uri @unicorn; location @unicorn { proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; proxy_set_header Host $http_host; proxy_redirect off; proxy_pass http://unicorn-<%= application %>; } error_page 500 502 503 504 /500.html; client_max_body_size 4G; keepalive_timeout 10; }

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Ubuntu 12.10 64bit host reboots when trying to install any guest system using VirtualBox

- by gts123

I am having a really nasty problem with VirtualBox as everytime I try to install any guest OS(using ISO file as CD for installation media), the installation starts normally but as soon as it is about to start either installing to virtual hard drive or loading(e.g. as LiveFS) it causes the host system to reboot abruptly. Config is as below: Host system: Ubuntu 12.10 64bit - Intel® Core i7-2640M CPU @ 2.80GHz × 4 Virtualbox version: 4.1.18_Ubuntu r78361 Guest OS systems tried: 32bit version of FreeBSD 9, Debian 6, Tails 0.14 VM setup Tried to have the minimal setup necessary just in case it would avoid for each system to make sure I'd avoid conflicts, but to no avail. I've tried different values and combinations of the below but the problem still persists: Shared Clipboard: Disabled Show in fullscreen/seamless: Disabled Remember runtime changes: DIsabled Base Memory: 2048 MB Chipset: PIIX3 IO APIC: Disabled EFI: Disabled Absolute Pointing device: Disabled Processor(s): 1 CPU PAE/NX: Disabled VT-x/AMD-V: Disabled Video Memory: 12 MB 3d/2d acceleration: Disabled Storage IDE COntroller: PIIX3 (same as chipset instead of PIIX4) Use host I/O cache: No Audio: disabled Network adapter: NAT USB controller: disabled No shared folder Also another sideeffect of the reboot is that it appears that it does not log any information in the error log files; not making things any easier. Please help.

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How browsers handle multiple IPs

- by Sandman4

Can someone direct me to information on exact browsers behavior when browser gets multiple A records for a given hostname (say ip1 and ip2), and one of them is not accessible. I interested in EXACT details, like (but not limited to): Will browser get 2 IPs from OS, or it will get only one ? Which ip will browser try first (random or always the first one) ? Now, let's say browser started with the failed ip1 For how long will browser try ip1 ? If user hits "stop" while it waits for ip1, and then clicks refresh which IP will browser try ? What will happen when it times-out - will it start trying ip2 or give error ? (And if error, which ip will browser try when user clicks refresh). When user clicks refresh, will any browser attempt new DNS lookup ? Now let's assume browser tried working ip2 first. For the next page request, will browser still use ip2, or it may randomly switch ips ? For how long browsers keep IPs in their cache ? When browsers sends a new DNS request, and get SAME ips, will it CONTINUE to use the same known-to-be-working IP, or the process starts from scratch and it may try any of the two ? Of course it all may be browser dependent, and may also vary between versions and platforms, I'd be happy to have maximum of details. The purpose of this - I'm trying to understand what exactly users will experience when round-robin DNS based used and one of the hosts fails. Please, I'm NOT asking about how bad DNS load balancing is, and please refrain from answering "don't do it", "it's a bad idea", "you need heartbeat/proxy/BGP/whatever" and so on.

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Roaming Profiles & Redirected Folders - storage consumption? offline files and caching?

- by Ben Swinburne

I understand the concepts of both roaming profiles and folder redirection and have used both separately before. I am about to set up a network from scratch and would ideally like to use both for the following reasons primarily Roaming profiles allow users to log on to any machine and have their profile Redirected profiles allow users to have their My Documents and Desktop etc backed up without the need to log off at the end of the day. The servers can run their backups overnight and there are no missing files due to the user not logging off. Redirected profiles largely alleviate the slow log in times caused by large profiles. My question is if some of the folders are redirected and therefore not part of the roaming profile what happens on machines which truly roam (i.e. laptops)? If there's offline files or a cache does this mean that the problem whereby a user has to log off comes back? By having them both enabled, is there any duplication i.e. if I have a users$ share and a profiles$ share would I have Desktop twice for example?

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Important hardware components to avoid bottlenecks/improve speed on a laptop?

- by joelhaus

Looking for a powerful general use (including web development) laptop running Windows. Price points seem to be all over the place. Many less powerful machines are priced much higher than machines with better specs. How does one navigate this market? Are there any unpublished/under-publicized specs/bottlenecks you look for? Understanding that hardware improves over time, is there an efficient ratio that can be used (or something similar, like Windows Experience Index?) which will indicate how powerful a system is? Thanks in advance! P.S. Here is an example from a laptop released on September 17, 2010. Can anyone pick apart these specs? Is there missing information you would be looking for? OS: Win 7 Display: 16.4" LED backlit Processor: Intel Core i7-740QM, 6MB L3 Cache RAM: 6GB DDR3 1333MHz (8GB max.) Graphics: NVIDIA GeForce GT 425M (1 GB of dedicated DDR3) HDD: 500GB 7200RPM SATA Hard Drive Removable Disc: Blue-ray with DVD±R/RW Misc: webcam/mic/speakers/bluetooth (via Sony Vaio VPC-F137FX/B)

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datawind ubislate 9ci tablet computer hanging on boot

- by user57924

I am new to this forum. I purchased a new tablet Datawind Ubislate 9ci. It is a 9 inch no-bluetooth tablet. Details: Android 4.1.1 Rock chip RK2928 KERNEL linux version 3.0.36 I was trying to install CWM through mobile odin and ROM manager but my tablet was not supported so i downloaded build.prop editor from google play and changed it to some other cwm recognizable model viz. Samsung, nexus etc. When i was doing the above mentioned procedure, suddenly my tablet is coming up to bootloading and hanging there only and not opening i went to recovery and tried to do wipe data factory reset but failed to get opened after boot android system recovery(3e) has the following options 1)reboot system now 2)apply update from ADB 3)apply update from external storage 4)update rkimage from external storage 6)wipe data factory reset 7)wipe cache partition 8)recovery system from back up i tried to do wipe data factory reset 2-3 times but still hanging at boot i had not made any back up before this bootloop and also tried hard reset by pressing needle at the back please somebody help me to get rid of this problem and also tell me how to unlock bootloader thank you

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Lion MacBook Pro will not load webpages with DNS just after wake

- by NReilingh

I'm working with a 2011 MacBook Pro running Lion (10.7.2), that after waking from sleep (i.e. opening the lid) takes an inordinately long amount of time (2-3 minutes or more) to get a usable internet connection. Upon waking, the wi-fi icon signifies it is negotiating a network connection, and completes one a few seconds later. At this point, network diagnostics will not show any issues, and everything in Network preferences looks as normal: I'm connected to the proper network, have the right IP address and gateway, and DNS settings are correct. However, any site accessed with a domain name (like http://www.google.com) in Safari will return the "You are not connected to the Internet." error. Accessing a site directly, say, with Google's 74.125.226.212, is successful. Yet, Network Diagnostics will insist that DNS is functioning properly. After a few minutes, the following lines will be printed to the Console log, and regular behavior will be restored. 11/18/11 8:11:31.288 PM airportd: _doAutoJoin: Already associated to “Wireless”. Bailing on auto-join. 11/18/11 8:11:32.000 PM kernel: en1: BSSID changed to 00:25:9c:63:91:bd This behavior occurs only when waking from sleep--not when turning wi-fi on and off. This problem also occurs when using a wired Ethernet connection. As per this thread, I have tried flushing the DNS cache and wiping the wireless network from memory (it's not a protected network). Neither have worked.

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Why is writing to my external hard drive slow, while benchmarks show fast writing?

- by matix2267

I have an iOmega eGo 320GB portable drive connected through USB2.0 to my laptop running Windows Vista. It's been working fine for quite some time until recently it became very slow when writing e.g. when copying ~300MB movie over to the drive at first it is extremely fast but it actually doesn't write it only puts in cache and then hangs on last 10-20MBs for about a minute. When copying larger files it's the same story: starts fast but then slows down to ~5MB/s (sometimes even slower down to 2MB/s). Strange thing is that I have always had caching disabled for this drive (it was disabled by default and I never bothered changing it). At first I thought that the disk is dying so I checked S.M.A.R.T. values and everything is fine there. I also run chkdsk and it seemed to fix the problem - it worked fast for a few minutes but then it slowed down again. I also tried plugging it into another USB port - no difference. Additionally I noticed that reading under certain circumstances is sometimes slower e.g. loading times for some games are ~10 times longer, whereas simple copying files from this drive to my internal HDD is fast. I ran a speed benchmark using CrystalDiskMark with a 5x100MB run and strangely got these results: read write (MB/s) Seq 33.05 28.25 512k 17.30 15.27 4k 0.267 0.372 4kQD32 0.510 0.260 This is different from what most other people have (I've found many threads about slow disk write while googling but all of them were slow on benchmarks too) which is why I decided to post this problem here. BTW most of the time when writing (or sometimes reading) the activity led is mostly idle (blinks a while and then stops for longer, sometimes has slower blinks ~1 sek, sometimes goes off for a few seconds - extremely long blink :) ) but when benchmarking, defragmenting or just reading (copying from this drive, installing apps from installers there, watching HD videos) it is blinking really fast (like it should) and there are no slowdowns. It shouldn't be driver issue unless stock Windows drivers have some issues I'm not aware of.

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Move OS from RAID5 array to RAID 1 arrays

- by Antoine

I want to give a last boost to my old ProLiant ML350 G5 server which just needs to be reliable for a few more year only ! With a defined budget of about 1500$ (I do not have more), i plan to replace the CPU (+ adding a second one), the battery cache of my raid controller (E200i), double the RAM, and change all hard drives. I have 7 HDD (SAS 10krpm, 72Gb) + 1 spare in RAID5, and my system is all FULL (no empty tray, full disks). in my current RAID5 array, I have 2 partitions: - 1 OS partition, 20Gb - 1 data partition, 350 Gb I plan to replace these 8 disks with : - 2 x 300Gb SAS 15krpm in RAID 1 (= 1 partition for OS) - 2 x 2Tb SATA 7.2krpm in RAID 1 (= 1 partition for DATA) My biggest constraint is that I have only 01 day to upgrade my server. Therefore, I'm looking for cloning all my files (OS + data partition) to my new arrays, i.e : - the OS partition shall be cloned to the RAID1 "2x300Gb array" - the data partition shall be cloned to the RAID1 "2x2Tb array" My second problem is that I need to physically remove all the old hard drives before inserting the new ones. I'm running Windows Server 2003 R2, and even if MS support will expire soon, I cannot buy a new licence and spent time in configuration. Obviously, with 1500$, I cannot also buy a new server that I could start configuring from now ! Thought about ASR (NTBackup), but I have no floppy drive (and do not really want to invest in one !) Thought about a clonezilla clone, and read this interesting link : Windows Server 2003 - move C: partition to a new SAS disk , but i'm not so confident in using Clonezilla with RAID5. What should be the best option to quickly and easily (if possible!) "copy/paste" my OS (so no need to reinstall and reconfigure all) and DATA / programs / services, etc... ? Thanks for your comments

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How do you enable view source in ie8 when it gets magically diabled

- by Tim Meers

I have multiple computers that all seem to have View Source disabled from the content menu when you right click on a web page. Now I know it's not that the web page is some how disabling it, I'm pretty sure thats not even possible. But alas I have at least 3 machines in my office (not on AD) that have this problem. I have also worked on clients computers that have this same issue. It's down right maddening! I tried to Google for it, but it just shows results from the dawn of IE6 in all of it's "glory" with a bug where if the cache was full it would be disabled. But this is not the case in IE8. Any body have a clue why this is happening, or a fix for it? Maybe a reg setting? Update: So I got a little closer to solving it, but there was still an issue on one computer where it allowed it not is HTTP, but not in HTTPS. One other computer works correctly in both. I Found these two keys missing in the registry: [-HKEY_CURRENT_USER\SOFTWARE\Microsoft\Internet Explorer\View Source Editor] [-HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\View Source Editor]

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"Can't find root filesystem / error mounting /dev/root" when booting to new kernel

- by salparadise

I am trying to upgrade my kernel from 2.6.18-274 to 2.6.39 for some wireless card drivers. When I boot into the new kernel I get the "Can't find root filesystem / error mounting /dev/root" googling led me to this page http://fedoraproject.org/wiki/Common_kernel_problems#Can.27t_find_root_filesystem_.2F_error_mounting_.2Fdev.2Froot From what I am reading seems to be an issue with a driver for my SATA controller or HD, but I can't find what option I need to add to the kernel. Doing a diff from the old initrd to the new one gives me the following: root-> diff /tmp/kafter /tmp/kbefore 6a7,8 > lib/dm-message.ko > lib/dm-region_hash.ko 8a11 > lib/dm-raid45.ko 13d15 < lib/dm-region-hash.ko 16a19 > lib/dm-mem-cache.ko Do I need any of those? not sure if I would need dm-raid45.ko as I am not running a raid. I have the same SATA and IDE options configured for both kernels so not sure what else to look for, any help is appreciated. Additionally here is the HW info: 00:1f.2 IDE interface: Intel Corporation 82801FB/FW (ICH6/ICH6W) SATA Controller (rev 03) (prog-if 8f [Master SecP SecO PriP PriO]) Subsystem: Hewlett-Packard Company Unknown device 3006 Flags: bus master, 66MHz, medium devsel, latency 0, IRQ 233 I/O ports at 1818 [size=8] I/O ports at 1830 [size=4] I/O ports at 1820 [size=8] I/O ports at 1834 [size=4] I/O ports at 14f0 [size=16] Capabilities: [70] Power Management version 2 root-> smartctl -a /dev/sda ... === START OF INFORMATION SECTION === Device Model: WDC WD5000AADS-00S9B0

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