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• picking a linux compatable motherboard

  - by Chris

  Last time I bought a new computer (I build them myself) I got a motherboard that had really poor linux support for a long time. Specifically the audio. I had to wait months before the kernel supported the on board audio chipset. That is exactly the situation I'm trying to avoid this time around. I have some specific questions about "server motherboards" actually. I looked at a few models of server motherboards by intel, and some random models on newegg. I wasn't able to see much of a difference from regular desktop motherboard other than most had two sockets, and support for much more ram. These boards seem more popular with Linux users. Why? AMD and Intel both have server CPUs as well. Some question, what's the difference? To make this question more concrete, I was looking at this this motherboard. The main questions about it that I can't answer are: Can I get a motherboard without on board raid and audio? I wanted to get a hardware raid controller and a PCI audio card. I thought a server motherboard would be cheaper and not have these "extras", since who wants an audio card on a server? Where can I found out about Linux support for the components on this board? "Intel ICH10R", "Realtek ALC889", "Marvell 88E8056" I'm buying this computer to work as a Linux desktop for a lot of compiling, coding and audio/video work, but I don't want to rule out the possibility of installing windows and playing some games at one point. (even if the last game I got has been sitting in its box unopened for almost a year). Is it a good idea to buy a "server motherboard" and play games on it, or are desktop boards better value for this? The ultimate solution for me would be a motherboard that had GPL divers for onboard LAN, a single CPU socket, lots of PCI express and PCI. USB 3.0, and no fancy hard disk controllers since I'll be getting a separate one.

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• OpenVZ vs KVM for Linux VMs

  - by Eliasdx

  Hardware: Intel® Core™ i7-920, 12 GB DDR3 RAM, 2 x 1500 GB SATA-II HDD (no SoftRaid because Proxmox developers don't support softraid and they are sure you'll run into problems) Software: Proxmox VE with KVM and OpenVZ support and debian everywhere I want to run multiple Linux VMs on this server. One for a firewall (I want to try pfSense), one for MySQL, one VM for nginx (my stuff) and ~2 VMs with nginx for other people's web sites. I don't think that pfSense will run in an OpenVZ environment but it should run in KVM. The question is if I should setup the other VMs using KVM or OpenVZ. In OpenVZ they should have less overhead for the OS itself but I don't know about the performance. I heard that KVM is more stable but needs more RAM and CPU. I found this diagram showing a OpenVZ setup on the same hardware I'm using. This guy uses an own VM for each and every website which is running on his server. I can't think of any advantage why he's using so many VMs.

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• BizTalk/MQ - DCOM was unable to communicate with the computer xxx using any of the configured protocols

  - by NealWalters

  I've read the other questions on this same error, but don't see a close match to this scenario. We got 18 of these last night between 12:17:13 and 12:39:37 on Win 2008/R2. It caused us to lose connectivity between BizTalk 2010 and WebSphere MQ machine. All our BizTalk machines (Prod, QA, Train, etc...) got the messages at the roughly same time and in the same quantity (about 18 of them). Computer xxx is the WebSphere MQ machine. What could cause this in the middle of the night? The servers are configured and running in Prod for a couple of years. There is no Win Firewall running, and servers are practically on the same rack. Could a run-away or 100% utilized CPU on the WebSphere MQ cause this issue? What else could cause it? BizTalk did NOT auto-recover from this situation. The above was followed by thousands of this message in the BizTalk event logs: The adapter "MQSeries" raised an error message. Details "Error encountered on Queue.Get Queue name = MyQManager/MyQueueName Reason code = 2354.". We restated BizTalk host instances, and it did not come back right away. It seemed we had to stop host instances for about two minutes, then start them.

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• Time-Machine backup over SSH tunnel to NFS mount

  - by BTZ

  I've recently started using a new NAS which runs CentOS 6.2. One of the purposes of the NAS would be to serve as a backup target. Whilst I have been using Apple's Time-Machine for a while and I am very satisfied with it, I'd like to continue using it. Backing up directly to an address in my network is no hassle; all works fine. For security reasons I'd like all my traffic to go through an ssh tunnel to the NAS. This way I can avoid needing to get a VPNserver (for personal reasons). As of NFSv4 the NFS deamon is bound to port 2049, which makes it easy for me to direct all traffic through a ssh tunnel. Tunnel: ssh -f admin@ms -L 2000:localhost:2049 -N Mount: mount -t nfs -o nfsvers=4,rw,proto=tcp,sync,intr,hard,timeo=600,retrans=10,wsize=32768,rsize=32768,port=2000 localhost:/mac_backup /Volumes/backup This works fine for Finder/terminal and throughput is almost equal to direct traffic. (CPU of the NAS does ride high when I reach max bandwidth though) Now the problem: With Time-Machine I can't use the NFS mount point mounted on localhost. TM seems to try to connect to it and then give me a "OSStatus error 65". I also tried using NFSv3 (I correctly forwarded all ports) with no luck. Can anyone shed a light on this and/or give a solution?

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• Server stops responding, can't find issue?

  - by Corey W

  I've had a pretty basic server up and running CentOS with webserver/database, and have noticed that it has locked up a few times in the middle of the night. It seems to happen randomly. When it locks up I can ssh in, (although it seems to hang once connected), but can't access cpanel/whm and have to reboot the server to get everything back up. Checking the messages log I see the below like clockwork every 5minutes 1 second, and then it just stops logging anything until I reboot. I can't seem to find any log showing any issue? Is there somewhere I can check to try to figure out what is happening? Could this be caused by CPU being maxed? Nov 17 08:01:35 s1 pure-ftpd: (__cpanel__service__auth__ftpd__Q13SKrtaCJCHjBezTfU8Iqmsi@127.0.0.1) [INFO] Logout. Nov 17 08:06:36 s1 pure-ftpd: ([email protected]) [INFO] New connection from 127.0.0.1 Nov 17 08:06:36 s1 pure-ftpd: ([email protected]) [INFO] __cpanel__service__auth__ftpd__mxidFBSnQXmR0QzqSxlqrXLIH0CmJ0GPh9bZ5V3 is now l ogged in Nov 17 08:06:37 s1 pure-ftpd: (__cpanel__service__auth__ftpd__mxidBDaCgnqSxlqrXLIH0CmJ0GPh9bZ5V3@127.0.0.1) [INFO] Logout. Nov 17 08:11:37 s1 pure-ftpd: ([email protected]) [INFO] New connection from 127.0.0.1 Nov 17 08:11:38 s1 pure-ftpd: ([email protected]) [INFO] __cpanel__service__auth__ftpd__T4B7F71acf1dsdJSeJHdqKNcbOdpzNnN_GttgcM is now l ogged in Nov 17 08:11:38 s1 pure-ftpd: (__cpanel__service__auth__ftpd__T4B7F71acf1KNcbOdpzNnN_GttgcM@127.0.0.1) [INFO] Logout. Nov 17 08:16:38 s1 pure-ftpd: ([email protected]) [INFO] New connection from 127.0.0.1 Nov 17 08:16:38 s1 pure-ftpd: ([email protected]) [INFO] __cpanel__service__auth__ftpd__W5C1RzumtaNwe4cU8Lt1 is now logged in Nov 17 08:16:38 s1 pure-ftpd: ([email protected]) [INFO] Logout. Nov 17 09:10:58 s1 kernel: imklog 4.6.2, log source = /proc/kmsg started. Nov 17 09:10:58 s1 rsyslogd: [origin software="rsyslogd" swVersion="4.6.2" x-pid="1094" x-info="http://www.rsyslog.com"] (re)start Nov 17 09:10:58 s1 kernel: Initializing cgroup subsys cpuset

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• Monitoring AWS Systems Behind ElasticBeanStalk

  - by A. Avadis

  So I'm getting a company set up in the Amazon Cloud -- creating IAAS protocol/solutions/standardized implementation, etc while also being the SysAdmin for individual systems, app environments, and day-to-day uptime. One of the biggest issues I'm having is tracking various system/application logs, as well as logging/monitoring/archiving system metrics like memory usage, cpu usage, etc etc In a centralized fashion. E.g. -- Nagios + Urchin. The BIGGEST impediment to my endeavors is the following: The company application is deployed in the form of a Java *.WAR file, uploaded to an Elastic BeanStalk application environment, load balancing and auto-scaling between 3(min) and 10(max) servers, and the EC2's that run the application are fired up and disposed of ad-hoc. That is to say, I can't monitor the individual EC2's for very long because so many are being terminated then auto-provisioned/auto-scaled on the fly -- so I'd constantly be having to "monitor what I'm monitoring", and continuously remove/add EC2 machine addresses to my monitoring lists. IS there some sort of way to use monitoring tools like Zabbix or Nagios to monitor the ElasticBeanStalk, and have it automatically add on new EC2's, and remove terminated/failed EC2's from its monitoring list automatically? Furthermore, is there anything I can do with GrayLog to achieve similar results with the aggregation/centralization of my application logs from multiple EC2 instances into ONE consolidated set of logs/events? If not GrayLog, is there ANYTHING LIKE GrayLog that can automatically detect what EC2 members are being added/removed from the environment, and collect the logs from them automatically? Any and all advice or direction is appreciated. Thanks much, and cheers!!

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• FreeBSD's ng_nat stopping pass the packets periodically

  - by Korjavin Ivan

  I have FreeBSD router: #uname 9.1-STABLE FreeBSD 9.1-STABLE #0: Fri Jan 18 16:20:47 YEKT 2013 It's a powerful computer with a lot of memory #top -S last pid: 45076; load averages: 1.54, 1.46, 1.29 up 0+21:13:28 19:23:46 84 processes: 2 running, 81 sleeping, 1 waiting CPU: 3.1% user, 0.0% nice, 32.1% system, 5.3% interrupt, 59.5% idle Mem: 390M Active, 1441M Inact, 785M Wired, 799M Buf, 5008M Free Swap: 8192M Total, 8192M Free PID USERNAME THR PRI NICE SIZE RES STATE C TIME WCPU COMMAND 11 root 4 155 ki31 0K 64K RUN 3 71.4H 254.83% idle 13 root 4 -16 - 0K 64K sleep 0 101:52 103.03% ng_queue 0 root 14 -92 0 0K 224K - 2 229:44 16.55% kernel 12 root 17 -84 - 0K 272K WAIT 0 213:32 15.67% intr 40228 root 1 22 0 51060K 25084K select 0 20:27 1.66% snmpd 15052 root 1 52 0 104M 22204K select 2 4:36 0.98% mpd5 19 root 1 16 - 0K 16K syncer 1 0:48 0.20% syncer Its tasks are: NAT via ng_nat and PPPoE server via mpd5. Traffic through - about 300Mbit/s, about 40kpps at peak. Pppoe sessions created - 350 max. ng_nat is configured by by the script: /usr/sbin/ngctl -f- <<-EOF mkpeer ipfw: nat %s out name ipfw:%s %s connect ipfw: %s: %s in msg %s: setaliasaddr 1.1.%s There are 20 such ng_nat nodes, with about 150 clients. Sometimes, the traffic via nat stops. When this happens vmstat reports a lot of FAIL counts vmstat -z | grep -i netgraph ITEM SIZE LIMIT USED FREE REQ FAIL SLEEP NetGraph items: 72, 10266, 1, 376,39178965, 0, 0 NetGraph data items: 72, 10266, 9, 10257,2327948820,2131611,4033 I was tried increase net.graph.maxdata=10240 net.graph.maxalloc=10240 but this doesn't work. It's a new problem (1-2 week). The configuration had been working well for about 5 months and no configuration changes were made leading up to the problems starting. In the last few weeks we have slightly increased traffic (from 270 to 300 mbits) and little more pppoe sessions (300-350). Help me please, how to find and solve my problem?

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• When machine is turned on, only the fan runs

  - by Gopal

  Hi, I have an issue slightly similar to this one posted here, http://superuser.com/questions/127016/troubleshooting-monitor-never-turns-on-system-fans-running-dvd-rom-does-not-op My configuration is as follows: EPOX 9NPA+ Ultra motherboard AMD Athlon 64 CPU Corsair 2 x 1GB PC3200 DDR RAM 1 DVD RW drive and 1 CD ROM Drive SATA 250 GB Hard drive 400W Power supply EVGA 256MB graphics card I have had this configuration for about four years. Last month, I started having issues in starting the machine. It wouldn't start when I press the ON button in the front of the case. So I used to pull out the power cord and plug it back in and then switch on in the front, and it used to work fine. And then one fine day, when I plugged in the power cord at the back, even without switching on the power-on button at the front, I saw that the fan at the back was running. So I opened the system. Then I could see that all the fans inside were running. I replaced the power supply. No luck there. Then I replaced the CMOS battery. Again nothing improved. Even when I removed all the cards and memory, I still get one short beep. That's it. Any idea how to proceed on this? Anything else could be checked? I want to confirm if this is a motherboard failure, before proceeding to replace it.

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• uname -a gives wrong version of kernel in gentoo?

  - by freedrull

  Hi I'm running gentoo and doing uname -a gives the wrong kernel version. tony@P_P-o ~ $ uname -a Linux P_P-o 2.6.27-gentoo-r8 #12 SMP PREEMPT Sun Nov 8 19:46:59 PST 2009 i686 Genuine Intel(R) CPU T2060 @ 1.60GHz GenuineIntel GNU/Linux Running eix gentoo-sources shows that I have a later version than that installed: tony@P_P-o ~ $ eix gentoo-sources [U] sys-kernel/gentoo-sources Available versions: (2.6.16-r13) 2.6.16-r13!b!s (2.6.25-r9) 2.6.25-r9!b!s (2.6.26-r4) 2.6.26-r4!b!s (2.6.27-r8) 2.6.27-r8!b!s (2.6.27-r10) 2.6.27-r10!b!s (2.6.28-r5) 2.6.28-r5!b!s (2.6.28-r6) 2.6.28-r6!b!s (2.6.29-r5) 2.6.29-r5!b!s (2.6.29-r6) 2.6.29-r6!b!s (2.6.30) ~2.6.30!b!s (2.6.30-r3) ~2.6.30-r3!b!s (2.6.30-r4) 2.6.30-r4!b!s (2.6.30-r5) 2.6.30-r5!b!s (2.6.30-r6) 2.6.30-r6!b!s (2.6.30-r7) 2.6.30-r7!b!s (2.6.30-r8) 2.6.30-r8!b!s (2.6.31) ~2.6.31!b!s (2.6.31-r1) ~2.6.31-r1!b!s (2.6.31-r2) ~2.6.31-r2!b!s (2.6.31-r3) ~2.6.31-r3!b!s (2.6.31-r4) ~2.6.31-r4!b!s {build symlink ultra1} Installed versions: 2.6.27-r8(2.6.27-r8)!b!s(07:48:25 PM 06/19/2009)(-build -symlink) 2.6.28-r5(2.6.28-r5)!b!s(12:35:17 PM 06/08/2009)(-build -symlink) 2.6.29-r5(2.6.29-r5)!b!s(07:44:33 PM 06/19/2009)(-build -symlink) 2.6.30-r6(2.6.30-r6)!b!s(11:14:45 PM 10/02/2009)(-build -symlink) Homepage: http://dev.gentoo.org/~dsd/genpatches Description: Full sources including the Gentoo patchset for the 2.6 kernel tree What gives?

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• PHP Causing Segmentation Fault & Apache Blank Response

  - by Joe

  I recently updated a Debian Lenny server to php 5.3,5 using the dotdeb source. Soon after doing so certain (but not all) sites on the server stopped responding to requests. A blank response would be returned - no headers, no content, nothing. I found this related question on stackoverflow which seems to describe something similar and used the same code the user had in their answer to see if I could replicate the issue: <?php class A { public function __construct() { new B; } } class B { public function __construct() { new A; } } new A; print 'Loaded Class A'; ?> This triggered the problem - the page returned absolutely nothing despite the original question stating this was fixed in PHP 5.5.0. No CPU block as you'd expect, no wait, just an almost instant zero response. I then ran this same code from the cli (php -f test.php) and the only output I got was 'Segmentation fault'. Tailing the kernel log I've spotted: Feb 16 07:04:06 creature kernel: [192203.269037] php[17710] general protection ip:76ef37 sp:7fff155e9bb0 error:0 in php5[400000+870000] Feb 16 08:57:31 creature kernel: [199639.699854] apache2[31136]: segfault at 7fff13a84fe0 ip 7f730514ea40 sp 7fff13a85008 error 6 in libphp5.so[7f7304ce8000+915000] All extremely odd and I'm not sure what it's pointing to/what I should do to debug this further. As I said some sites work but code such as the above definitely trigger it. Not that the sites I want to server have code like that - it's just an example. Any help is much appreciated!

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• Access to File being restricted after Ubuntu crashed

  - by Tim

  My Ubuntu 8.10 crashed due to the overheating problem of the CPU when I am opening some directory and intend to do some file transfer under Nautilus. After reboot, under gnome, all the files cannot be removed, their properties cannot be viewed and they can only be opened, although all are still fine under terminal. I was wondering why is that and how can I fix it? Thanks and regards UPdate $ cat /etc/mtab /dev/sda7 / ext3 rw,relatime,errors=remount-ro 0 0 tmpfs /lib/init/rw tmpfs rw,nosuid,mode=0755 0 0 /proc /proc proc rw,noexec,nosuid,nodev 0 0 sysfs /sys sysfs rw,noexec,nosuid,nodev 0 0 varrun /var/run tmpfs rw,nosuid,mode=0755 0 0 varlock /var/lock tmpfs rw,noexec,nosuid,nodev,mode=1777 0 0 udev /dev tmpfs rw,mode=0755 0 0 tmpfs /dev/shm tmpfs rw,nosuid,nodev 0 0 devpts /dev/pts devpts rw,noexec,nosuid,gid=5,mode=620 0 0 fusectl /sys/fs/fuse/connections fusectl rw 0 0 lrm /lib/modules/2.6.27-15-generic/volatile tmpfs rw,mode=755 0 0 /dev/sda8 /home ext3 rw,relatime 0 0 /dev/sda2 /windows-c vfat rw,utf8,umask=007,gid=46 0 0 /dev/sda5 /windows-d fuseblk rw,allow_other,blksize=4096 0 0 securityfs /sys/kernel/security securityfs rw 0 0 binfmt_misc /proc/sys/fs/binfmt_misc binfmt_misc rw,noexec,nosuid,nodev 0 0 gvfs-fuse-daemon /home/tim/.gvfs fuse.gvfs-fuse-daemon rw,nosuid,nodev,user=tim 0 0

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• Computer Freezes with "Bugcheck 0" on Windows 7. How do I figure out why?

  - by George Stocker

  After about 10 minutes of running, my computer will hang, exhibiting the following symptoms: Both monitors act as if there is no image being sent to them (on, but blacked out) The CAPS Lock key on the keyboard will not respond. The computer appears to still be running: CPU Fan is whirring. When I reboot, Windows says "The previous shutdown was unexpected." I've enabled the 'don't automatically restart' on an error, and asked the computer to make a memory dump whenever it crashes, but it hasn't done either. The problem is that there's no bugcheck for me to go off of, so there's no way for me to determine what the cause is (I think). Here are my system specs: Intel Core 2 Duo E6750 Gigabyte P35C-DS3R w/ 4.00 GB (DDR2 Ram) Nvidia 8800 GT Windows 7 I've tried running the Windows Memory checker, but the system also freezes when using that after about 10 minutes as well. How can I diagnose the problem with no bugcheck and no ability to run a memory checker? Update Running Memtest86 also causes the computer to crash (looks like it doesn't make it through a full pass - it was only running for about 10 minutes when the PC stopped responding).

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• Desktop PC does not power up on power button

  - by hIpPy

  When I press the power button on my desktop, it does not power up completely. Before I press the power button, I see lights on the motherboard. Everything is normal. On power button press, the fans on the cpu, graphics card and motherboard start to spin a little for a second or two and then they stop. No beeps during this process. It has been doing this for a while now but it used to start up after some trials. Once it starts up, I have NO issues at all like random shutdowns so it is not an issue with OS. Update: I left the desktop off for a few days and it started. I'm just guessing here but it seems as if the PSU (Antec TP2-550ATX) is dying out and does not have enough power now - just a guess. It's an old desktop assembled in 2005 but I have maintained it well. Update: I always keep the desktop running and I never shut it down. During updates or manual restarts, it powers up without issues. I wonder if this sheds lights on the issue. Any idea how I can narrow down the issue? ex: if I can find if the PSU is dying etc. I'd really like to fix the issue. Please help. Thanks. Below is the complete configuration. DFI LAN-Party UT NF4 Ultra-D 6/23 {6.70}, Evercool EC-VC-RE 41/47C, AMD Opteron 170 2.0GHz {1.3.2.16} 1.312V 36/41C, ThermalRight SI-120, Panaflo 120×38mm OCZ Platinum 2×1GB 200MHz 2.66V 3-3-2-7 1T XFX 7800GTX 256MB 475/1250MHz {91.31}, Zalman VF900 Cu led 41/56C WD Caviar 320GB 7200RPM 16MB SATA 3Gb/s Antec TP2-550ATX Antec P180 WinXP sp3 Logitech MX310 Razer Mantis Speed BenQ FP91G+ 19" LCD 8ms DVI Creative Audigy2 ZS {4.42} BenQ DW1640 Logitech z-5300e 5.1 280W Legend: Driver versions: {} User settings: [] Voltage: V Wattage: W Temperature: C (Celsius) min/max

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• Which upgrade path for disk IO bound postgres server?

  - by user41679

  Hi all, We currently have a Sun x4270 with 2xquad core Xeon Nehalmen 2.93ghz cores (16 threads), 72 gig of ram and 16 x 10k SAS disks split between the os raid 1, a partition for the Write Ahead Logs which is raid 10 and a partition for the database tables and indexes which is also raid 10, all xfs. I'm currently evaluating which path to go down in terms of upgrades. We'll be sharding the DB at some point soon, but for now I need to focus on hardware upgrades specifically. The machine is not CPU or memory bound at all at the moment, just IOWait is become an issue. The machine is mostly write access as we have a heavy caching layer. We're seeing about 300 write IOPS average on both the database partitions. We don't have any additional storage infrastructure like a Fiber Channel or ISCSI network. Budget isn't too much of a concern, something inline with the size of this server (i.e no $1m IBM machines) Space is ok on the DB side of things, we're running out obviously but there's also some reduction we can do. Additional space would be good though. My current thoughts are either: * ISCSI SAN, possible with 10Gbit network that has solid state acceleration. * FusionIO card / Sun F20 card (will the FusionIO card work in the Sun box? * DAS shelf (something like this http://www.broadberry.co.uk/das-direct-attached-storage-servers/cyberstore-224s-das) which a combination of 15k sas disks and some Intel X25-E drives for DB indexes etc) what would I need to put in the x4270 to add a DAS shelf? I think it's a SAS HBA card, do I have to use Sun's own card or will any PCI Express card work? Anything else??? what would you guys do from your experience? I appreciate it's a lot of questions, but I haven't expanded a DB machine for a number of years and the landscape has changed dramatically since then! Any advice or feedback would be very much appreciated. Let me know if there's anything else I can clarify. Thanks in advance!

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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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• New to building computers worried about temps

  - by dave

  I'm new to building my own computers and I was wondering about maximum temperatures. I understand that the room temp can affect the computers temp but how relevent is it? I understand that if my room temp is 20°C none of my computer parts could be lower than that. But if my room is 27°C instead of 20°C would this cause my computers parts to heat up more/faster? My new computer I built myself for gaming is i7 2600k 16gb ram ddr3 1600 hd6970 2 gb 240gb ssd ( bought a nas with 3 2tb drives in raid 5 for my home network ) 850w modular psu I also have my old hp computer i3 2120 8gb ram hd6770 1tb hdd I also have 3 laptops in my household, but I am not worried about their temps, they heat up my legs but they are never under stress. Due to size and money reasons I used an old case and it only has one of the sides left on it. Is this bad for the computer and will the extra dust cause problems? Or should I leave it this way or take the missus wrath and buy a case? If so is there any certain case I should get? I don't care about looks I just want card reader and usb slots and for it to run as cool or cooler than now, my case has 1 fan. Also what are the max temps for my new and old computer parts? Is 40°C under load ok for my CPU, what about 70°C for my GPU is that ok too, or should I worry? What are normal and safe temps for my components? I have looked around but there seem to be lots of different answers. I know that 100°C is bad but I want my parts to last as long as possible and this site always seems to give good replies without arguing or flaming.

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• What steps should I take to debug this non-starting hvm virtual machine?

  - by Ophidian

  I have a dom0 machine running CentOS 5.4 with all the latest updates using Xen as my hypervisor. I am using Xen in part because this machine was set up prior to KVM being included in RHEL, and in part because KVM's network bridging configuration is not nearly as simple as Xen's. The dom0 machine is headless and I do all of my VM management via virsh from the command line. I have two hvm domU's: A web server running CentOS 5.4 A mail server running Gentoo Both VM's are backed by LV's on the dom0 but do not use LVM in the domU. Both have virtually identical libvirt configurations (differing by expected things like name, UUID, NIC MAC, VNC port, etc). The web server domU (WSdomU hereafter) does not start since applying the most recent kernel update (kernel-xen-2.6.18-164.15.1.el5.x86_64 and kernel-2.6.18-164.15.1.el5.x86_64 for the dom0 and WSdomU respectively). By 'not start' I mean it appears to be running but it does not use an CPU cycles, does not bring up a graphical console, and does not respond on the network. The WSdomU is listed as no state rather than the normal running or blocked in xentop. The mail server domU starts fine and functions normally. Here are the steps I have taken so far that did not solve the problem: Reboot the dom0 to see if things come up on their own Check xen dmesg on dom0 Check xend logs (a cursory viewing did not show anything blatant; specific suggestions of things to look for would be appreciated) Attempted to connect to the WSdomU's graphical (VNC) console from the dom0 Shutdown the mail server domU and attempt to start the WSdomU Check the SELinux labels on backing LV's (they're the same) Set SELinux to permissive and attempt to start the WSdomU Use virsh edit to try tweaking the WSdomU config virsh undefine, reboot, virsh define the WSdomU config dd the WSdomU LV to an .img file, copy it to my Fedora desktop and run it under KVM (works fine) What steps should I take next to debug this? I will edit in any additional configuration's requested in the comments.

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• Good references to know why has my computers stopped responding me

  - by Peterstone

  Hello all! I´m a windows xp user (but not for much time...) and I usually see how my computer stop of responding me. The process is this: Firsly it became totally stopped or very slow for certain periods of 5 minutes. How could I do? After that it gets stopped (Even not totally because If I click on the bar I see a blinking response in the bar botton of the program I click on. It´s could be anything related with security (like the firewall or some virus)? Computer university: I usually experience this, using Matlab (R2007a) with System Generator (its respective compatible version) My personal laptop: It´s usually works well but when stopped periods became to appears I know in not much time it will became totally stopped. I usually see how Word 2007 get stopped and after a while my windows xp gets stopped. (well I can access to the the manage task pressing ctr+alt and...). The only solution I see is to kill program by program... My petition: Please, I need good references that help me how to think in order to avoid or to manage the problems previously described. Does anyone know usefull books or articles? EDIT: Laptop: OS: XP Home Edition Version 2002 SP3 Hardware: HP Mini Intel(R)Atom(TM) CPU N270 @1,60GHz 1.99 GB RAM University Computer: OS: XP Profesional SP3 Hardware: AMD Athlon(tm) XP 1800+ 1.54 GHz, 768 MB RAM

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• EXCEL workbook, intermitently, takes 30 seconds to load

  - by Julio Nobre

  I am trying to figure out why a simple .XLS EXCEL workbook is taking, randomly, 30 seconds to open. Before answering: Please, bear mind the following: Problem symptoms Hanging is intermitent and it takes exactly 30 seconds; During hanging there is no cpu or disk activity; It only happens during workbook load. Every runs smooth after that; Windows Explorer.exe hangs on folder, but all other folders, system and applications are still responsive; There are no consecutive hangings. I have to wait for while to reproduce this behaviour; All workbooks where located on a local drive (C:\BPI); The workbook has no macros and no addins; Office 2003 is being used for several years; The computer is running Windows XP; Computer has several network mapped drives, all addressed to main file server; Recently, main fileserver was replaced by Windows 2011 SBS Standard Edition What I have done so far I have traced machine Explorer.exe, using Process Monitor, added Duration column, and filtered by Duration 1. That's is how I found that hanging was taking exactly 30 seconds. For further information, please refer to Oliver Salzburg tutorial. Using Process Monitor, I have also figured out than five operations were taking most of sample collecting duration. Looking at sample image below, column Operation below you will notice that one single operation was taking 29 seconds; I have tried different workbooks (all of them smaller than 30 KB); I have, temporarily, removed all shortcuts on User Document's folder that were pointing to network drives or shares; I have runned CCleaner to fix registry issues; I made sure that there were no external links on tested workbooks; I have reproduced this behaviour for hours; I have extensivelly researched for hours on the web; Process Monitor's collected and filtered data

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• split virtualization design based on environment or server role?

  - by Dan

  I'm setting up the server environment for a new software development group, which will include 4 test environments. These are web applications, so each environment will have an application server and a database server. I'm planning on buying two physical servers (e.g. 6-core CPU each with 12GB or so of RAM), and I'm thinking virtualization is appropriate here. With that in mind, I've thought of a couple ways that I could organize the virtualization strategy: - Separated by server role: Server 1 has all the application servers, each in their own guest VM. Server 2 has all the databases. OR - Separated by environment: Server 1 has a VM for two of the environments, with the VM containing both the app server and the database server. Server 2 would also contain two test environments, with the same style (app server and database in same VM). The advantages I see with all the app servers on one server and all the databases on another server is that I could probably be more efficient with the database server (one instance running multiple databases). But the other option seems easier to manage (archives/restorations would be contained in a single VM). Any recommendations? TIA.

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• how could application installations/configurations be easier in linux?

  - by ajsie

  although you can do anything in linux it tends to require a lot of tweaking in config files and reading a lot of manuals/tutorials before you can have it running in your way. i know that it gets a lot easier by time, and the apt-get installations with ubuntu/debian is heading the right way. but how can linux be more userfriendly for us in the future? i thought that if more is automated like an IDE environment, eg. typing svn will give us all the commands and description about each command when you move between commands with your keyboard. that would be great. but that's just one example. another is the navigation in the terminal between folders. now you have to type a lot just to jump from/to different folders. would be great with some more automatization here too. i know that these extra features will slow down the server, but its 2010 now, and these features are not that heavy for the cpu, but makes it more userfriendly and encourage maintainance of a server, not frighten u off. what do you think about this? should/could we have more user friendly linux environment in servers, something that has annoyed you a lot? a lot of things are done in the unix way, but maybe we should reinvent the wheel in some areas, cause apparently, its so...repeatingly today and difficult to do easy tasks. it should be easier i think..

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• Removing resource limits on Solaris 10

  - by mikeydonkey

  How should one remove all potential artificial resource limitations for a process? I just saw a case where a server application consumed resources so that some limitation was hit. The other shells into the same server etc were all extremely slow (waiting for something to free up for them; ie. prstat starting 5 minutes). It wasn't CPU/memory related problem so I think it has got something to do with ulimits / projects. Already managed to set the maximum open files to 500 000 and it helped a little bit. However there is something else and I can not figure out what resource is maxed out. I can get some in-house administrator probably to check this but I would like to understand how I could make sure there shouldn't be any limitations! If you think I am going the wrong way (would be better to figure out what limitation should be specfically tuned etc) please feel free to point me to the correct way. I know technical stuff - it's just Solaris 10 that is giving me headache :/

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• Applications randomly alt-tab? (especially full screen games)

  - by Henry Scotts

  I'm not sure when this began, how it happens, or why it happens, but it is quite bothersome and apparently random. Just randomly throughout the day my computer will just go to the desktop. I could be in a full screen game and it will just immediately alt tab and present the desktop. Or I could be watching a movie and this happens. Sometimes it happens once every three hours and other times (just today actually) it did it twice in the span of 30 seconds. I am positive I am not pressing a hotkey because I launched a game, sat idle, and noticed it alt tab while cleaning up around my room after about 20 minutes. Sometimes it goes days without this happening. Specs: Windows 7 Ultimate 64 Bit, 10 gigs of RAM, GeForce GTX 260, Intel Xeon CPU. I also have basically nothing running when it happens other than the game and FireFox. My FireFox add-ons: Adblock Plus, Download Statusbar, Firebug, FirePHP, lazarus form recovery, tree-style-tabs, yslow. I doubt FireFox is causing the issue but I figured I'd include it anyway because it is the only application I have running when it happens. As for user processes I have running: VCDDaemon (context menu for virtual clone drive), razerhid (mouse), OSD, taskhost, dmw (desktop window manager), anyfullscreengame, audiorepeater, netsession_win, explorer, razerofa, tsvncache, firefox, plugin-container, and EKIJ5000MUI (printer). Whew. Okay. That was a lot of information. If someone could diagnose this I would be most grateful for this has been around with me for years.. Thanks for reading! PS: I doubt it's a virus because I never download illegal software and pretty much only browse Reddit and Stackexchange and play games. If it was a virus it would be a pretty lame one.. Hah..

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• Bad Intel DQ965GF motherboard? Fails memtest, but memory is good.

  - by Boden

  I've got a machine with a DQ965GF motherboard. Two days ago it started locking up hard. Ran memtest 3.3, 1.7, and TestMem 4. TestMem just freezes, memtest failed on moving 8 bit inversions. Letting memtest run eventually causes the system to restart. I pulled memory sticks one by one, and then replaced the memory with a couple of known good sticks. No luck. I switched power supplies, didn't help. Swapped video cards just to be safe. No help. When I start the machine I get a single beep before it POSTs. According to the manual, a single beep means: 1 beep - Refresh Error (with nothing on the screen and it is not a video problem) I'm assuming that the motherboard has failed since it's obviously not a RAM or power issue. Do you agree? NOTE: I also tried resetting BIOS defaults, and even flashed the BIOS to the latest version. I also ran the Mersenne Prime Test and the CPU seems to click along just fine. (Tried logging in to superuser with openid but it's not working for me today. Hope this gets through)

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• Vista Screen resolution Changes when Switching Users

  - by Benjol

  I regularly have a problem when switching between users in Vista - the screen resolution drops down to 800x600. If I try to set the resolution back to the maximum, it says nothing, but just keeps it at 800x600. I can set it back to an intermediate value. Otherwise I have to either restart the PC, or sometimes if I log off one of the users, I can then set the resolution back to max. Might it also have something to do with using sleep mode instead of performing regular shutdowns? I thought it might be related to the desktop background image taking up too much space, but even with plain colours, the problem still occurs. There is an enormous thread on this here, but not really any answers. From what I can gather from that thread, it isn't related to any particular applications, nor limited to a particular make of graphics card or monitor, so I don't think that including hardware details is useful. This is a very annoying problem, as it screws up my desktop and screen layout every single time. Has anyone here experienced this problem or found a solution? I've noticed that Windows Update has tried to install nVidia updates and apparently they've failed on several occasions. Not sure if that is of any relevance or not. UPDATE The last post on the thread: FWIW - I had this problem for about 2 years and wrote a number of posts in this thread in the past. It survived OS reinstallation, change of practically all of my hardware piece by piece (mobo, cpu, monitor, graphics card, memory, power supply...) I used to be affected by this annoying problem at least once every 24-48 hours. About 1.5 months ago I wiped out my 32 bit vista ultimate installation and installed Windows7 ultimate 64 bit from scratch and never saw this problem again. GOOD RIDDANCE. Vista was a pathetic piece of __ that felt like a flashback to the old [horrible] NT4/Windows95 days. I was seriously considering switching over to Apple/Mac OSX if this problem persisted.

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