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• Doubts about Cloud Infrastructure

  - by Pravin

  Maybe a little more of the same questions that others have asked but wanted to clarify my doubt, for some years run my hosting company (reseller of esds) and I've done well so far, but I am determined to bring quality and server technology to offer another level. So far I have understood that there is a difference between cloud and cluster servers because the cluster function as load balancers that distribute in different servers roles and use the servers less overloaded in the cloud is the union of multiple servers and then the same is vitualized unlike the cluster that is allowed to use the resources of the CPU and RAM servers in the virtualized environment. My approach is to use 3 dedicated servers to create a cloud server, My doubts: Does this type of cloud servers are only reserved for big companies? (Either because the union of the servers is done by hardware or software with high price) What characteristics should these servers meet? Possibly through software which should be used? Available? Thanks for your time, Cheers!

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• Bad I/O scheduler?

  - by user62367

  os: up-to-date Fedora 14. Working as a "normal desktop". It's doing very well, but if i start VirtualBox, and e.g.: install a guest on it, it just "freezez". I mean if there are disk activities on a VirtualBox guest, then the computer becomes unrespondable..even the mouse is laggin for about 50 minutes.. What could be the bottleneck? What could be the problem? If anyone has any tips/howtos to speed it up, please help! It has a normal 2,5" HDD, with 5400 RPM. Does it worth for me if i buy a 2,5" HDD with 7200 RPM? T7200 cpu, 4 GByte RAM, "vm.swappiness = 0". Thank you!

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• Configure TV Capture card to not use external audio jack for TV audio output

  - by Adam D.

  I had this working with MythTV on Ubuntu 9.1. Then a power surge killed the motherboard. After replacing the motherboard, ram and cpu, the card does not produce any audio except through the output jack on the back of the card. I do not want to use a cable to go from the back of the card to the audio in on the built in sound card of the new mother board. FYI, the old motherboard did not have an on-board sound card. There was a separate audio card installed. There's some configuration that has to be done to have it work the same way again. I just have no idea where to start. This is regarding wintv hauppauge mythtv linux ubuntu 9.10 audio

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• fedora 11 server won't boot from SATA disk, won't boot from CD, BIOS configuration problems

  - by Tom

  Hi all, Yesterday our fc11 file/print server didn't boot, and had stopped on the BIOS page with a configuration problem. (with a distinct lack of foresight) I reset the BIOS settings to default without recording the message and booted the server. The server ran until it was to be booted this morning, and it was failing to mount the root partition from the SATA disk. It also failed to boot from a known good diagnostics CD. After a few more tries, it now fails part way through the Phoenix - AwardBIOS screen where it is listing the SATA/IDE devices, and it is showing garbage for the identity of one of the disks, which should actually be "none" It looks like the motherboard has gone kaput. The motherboard is an EVGA NF790i, are there any diagnostic tools that I can use to determine this? (as I would prefer to not send the motherboard back, only to discover that it is the RAM or the CPU) ps I can't get it to boot from the memTest disk, so I can't run that diagnostic. Thanks!

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• Linux process management

  - by tanascius

  Hello, I started a long running background-process (dd with /etc/urandom) in my ssh console. Later I had to disconnect. When I logged in, again (this time directly, without ssh), the process still seemed to to run. I am not sure what happened - I did not use disown. When I logged in later, the process was not listed in top at first, but after a while it reclaimed a high CPU percentage, as I expected. So I assume dd is still running. Now, I'd like to see the progress. I use kill -USR1 <pid> but nothing is printed. Is there any way to get the output again?

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• System shuts down immediately after few sconds

  - by Anil

  I have a computer with following specification and was working fine after re-installing the system and refitting sink fan unit. Recently it shuts down automatically after a few seconds. I checked PSU by shorting pin no.s 13 & 14 as well as 14 & 15. It worked well means the PSU fan moves. But I never checked the voltages at different wires. I refitted the heat sink fan by applying thermal paste. but it behaved the same. Again I refitted the Heat Sink Fan, then it worked for 2 minutes and again shut down. Now it shuts down immediately after switching on. Mother board : M26GTM-3VP CPU : AMD athlon PSU : 450 watt Can anyone help?

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• Leightweight Linux distro to install on my old PC

  - by Juri

  Hi, I have an old PC at home which is mainly used by my Mom or my brother just to browse the web and maybe open some PDFs / docs. Till now I had Win2000 installed, but it performs very poorly. So I thought about installing Linux on it. Could someone give me some suggestions for a leightweight Linux distribution which works well?? Is standard Ubuntu too heavy?? PC details CPU: Athlon AMD ~1211 MHz RAM: 1GB Grafics Card: NVidia GeForce FX 5200 (not so relevant,but still) Thx for your suggestions.

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• Ubuntu server very slow out of the blue sky (Rails, passenger, nginx)

  - by snitko

  I run Ubuntu server 8.04 on Linode with multiple Rails apps under Passenger + nginx. Today I've noticed it takes quite a lot of time to load a page (5-10 secs). And it's not only websites, ssh seems to be affected too. Having no clue why this may be happening, I started to check different things. I checked how the log files are rotated, I checked if there's enough free disk space and memory. I also checked IO rate, here's the output: $ iostat avg-cpu: %user %nice %system %iowait %steal %idle 0.17 0.00 0.02 0.57 0.16 99.07 Device: tps Blk_read/s Blk_wrtn/s Blk_read Blk_wrtn xvda 2.25 39.50 16.08 147042 59856 xvdb 0.00 0.05 0.00 192 0 xvdc 2.20 25.93 24.93 96530 92808 xvdd 0.01 0.12 0.00 434 16 xvde 0.04 0.23 0.35 858 1304 xvdf 0.37 0.31 4.12 1162 15352 Rebooting didn't help either. Any ideas where should I be looking?

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• Dedicated server not responding. Malicious?

  - by user2801881

  My Dedicated server dies for days on end. As soon as i reboot after about 20 seconds it does again. Then it will just work again and be fine for another week or so. Im convinced its malicious. Not sure what results or readings i can give you so just ask and i will do whatever is needed. netstat (top 20 connections) 7 79.142.88.250 8 120.202.249.19 8 159.226.21.62 8 188.168.38.102 8 202.114.6.37 8 222.62.207.70 9 60.191.35.42 10 112.124.46.186 10 116.228.55.184 10 181.133.218.11 10 222.90.111.146 11 183.136.146.110 12 124.127.51.135 12 92.225.24.24 13 221.176.23.242 15 119.10.115.165 16 17 218.6.224.66 21 116.228.55.217 24 114.112.194.19 top CPU usage seems to add up to about 10% Mailq is empty Thanks in advance

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• (OS 10055) Queue full

  - by Ali

  I'm using apache with mysql on the other server, apache on windows 2003 with 4gb ram 3 dual core CPU My server keep on running smoothly without any issue for about 3 days or roundabout 60+ hours however between 60-70 hours my apache stop working & log events shows this error, I tried to search a lot but helpless, I have already increased max port, please if someone can help ? (OS 10055)An operation on a socket could not be performed because the system lacked sufficient buffer space or because a queue was full. : make_sock: unable to listen for connections on address 0.0.0.0:80

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• Troubleshooting source of heavy resource-usage on a windows server 2008 running multiple sites

  - by batman_man

  Hi, I am running about 10 asp.net websites on a hosted virtual server. The server runs Server 2008 - each website is backed by its own database running on SQL server 2008 on the same box. Lately the box has seemed really slow. The only kind of discovery i could think of doing was looking in the task manager, where i can see w3wp and sqlserver.exe jumping to 40% cpu usage every 5-10 seconds. What are the steps i can take to determine which of my websites is taking these resources and or what database is getting hit the most? I have of course ssms installed on the machine as well. As you can tell, my sysadmin skills are very very limited - any help would be much appreciated.

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• udev: waiting for uevents to be processed on my Gentoo

  - by stan31337

  During the startup I see machine executing this thing for about 30 seconds: udev: waiting for uevents to be processed Then I get a quick message which says something like: devfs: timeout (50 seconds) I can't see the whole thing because after that system starts up very fast including Xfce. What logs and configs do I need to provide for further investigation? $uname -a Linux genta 3.6.6-gentoo #1 SMP Sun Nov 11 11:02:23 NOVT 2012 i686 Genuine Intel(R) CPU T2300 @ 1.66GHz GenuineIntel GNU/Linux Thank you! UPD: rc-status genta / # rc-status sysinit Runlevel: sysinit dmesg [ started ] udev [ started ] devfs [ started ] genta / # rc-status boot Runlevel: boot hwclock [ started ] modules [ started ] fsck [ started ] root [ started ] mtab [ started ] localmount [ started ] sysctl [ started ] bootmisc [ started ] hostname [ started ] termencoding [ started ] keymaps [ started ] net.lo [ started ] swap [ started ] urandom [ started ] procfs [ started ]

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• Is there a test to see if hardware virtualization (vmx / xvm) are presently enabled within a Linux session?

  - by Dr. Edward Morbius

  I'm writing procedures for configuring VirtualBox support for 64-bit SMP guests, which requires hardware virtualization suppot (VTx/Intel, AMD-V/AMD). I have successfully configured this myself, however I'd like the procedure to be clear. sed -ne '/^flags/s/^.*: //p' /proc/cpuinfo | egrep -q '(vmx|svm)' && echo Has hardware virt || echo No HW virt ... shows if the CPU is capable. I've still got to go enable the feature in BIOS. Any way to test from within Linux to see that this is no or not? Thanks.

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• Which is faster? 4x10k SAS Drives in RAID 10 or 3x15k SAS Drives in RAID 5?

  - by Jenkz

  I am reviewing quote for a server upgrade. (RHEL). The server will have both Apache and MySQL on it, but the reason for upgrade is to increase DB performance. CPU has been upgraded massively, but I know that disk speed is also a factor. So RAID 10 is faster performance than RAID 5, but how much difference does the drive speed make? (The 15k discs in the RAID 5 config is at the top of my budget btw, hence not considdering 4x15k discs in RAID 10, which I assume would be the optimum.)

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• How to disable Apache http compression (mod_deflate) when SSL stream is compressed

  - by Mohammad Ali

  I found that Goggle Chrome supports ssl compression and Firefox should support it soon. I'm trying to configure Apache to to disable http compression if the ssl compression is used to prevent CPU overhead with the configuration option: SetEnvIf SSL_COMPRESS_METHOD DEFLATE no-gzip While the custom log (using %{SSL_COMPRESS_METHOD}x) shows that the ssl layer compression method is DEFLATE, the above option did not work and the http response content is still being compressed by Apache. I had to use the option: BrowserMatchNoCase ".Chrome." no-gzip' I prefer if there are more general method in case other browsers supports ssl compression or some has a version of chrome that does not have ssl compression.

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• Improving Chrome performance on OSX

  - by Giannis

  There are a number of sites that do not display properly on Safari and I need to switch to Chrome. Although when the content of the sites requires flash player, Chrome will consume a significant amount of CPU. Running more than 3 windows, will cause my MBP to overheat, start the fans, and reduce battery life way more than Safari. What I am looking for is suggestions on ways to improve performance of Chrome running flash. I know Safari is optimised for OSX, but any improvement is welcome. Following I have a demo to display the issue. I am running same youtube video on Safari 6 and Chrome 21,both updated,at the same time. Both browsers have been reseted and have no extensions. This is run on MBP 13" 2012 with 2.9 i7 running OSX 10.8.1. p.s If any additional details can help please let me know.

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• Is putting the swapfile & temp folder to ramdisk a good idea in Windows 7 64 bit with lots of RAM?

  - by Tony_Henrich

  I want my Windows to run as fast as possible. If I have 12GB RAM in Windows 7 64bit, quad core CPU, and all apps fit in memory, will the swap file ever be used for anything? The question is about if it's a good idea to put the swap file in a RAM disk. Would a RAM disk help in any way or will Windows intelligently use all the available memory for all its work? I am also thinking of putting the temp folder on a RAM disk. I know the RAM disk is volatile memory and I don't care about its content if it gets lost.

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• Is Ubuntu Netbook Remix actually lighter than Ubuntu Desktop?

  - by D Connors

  I'm running ubuntu on my work notebook. While it's not a netbook, it is a relatively weak machine. So, even though I'm not a big fan of the ubuntu netbook interface, I would be willing to use it if it's lighter (on RAM and CPU) than the desktop version. I know there are some very light linux distros available out there, but I'd like to stick with ubuntu both for it's community and for the support I have available here at my workplace. So, is Ubuntu Netbook Remix lighter on system resources than Ubuntu Desktop?

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• Unlocking AMD Phenom II X2 550 Black Edition cores - what are the risks?

  - by Vilx-

  I've got the above mentioned CPU and a GigaByte GA-MA790XT-UD4P motherboard, which should be capable of unlocking the extra two cores - if I'm lucky and they're not faulty. The Internet is full of instructions on how to do that. What I don't have is spare money to buy new hardware if I brick something. What are the risks when attempting to do this? Is it completely safe, or can I be left with an expensive pile of junk? What should I keep in mind when doing so? Bigger cooler maybe (I'm running with the default box cooler)? Should I lower the frequencies too? I've never done any OC before.

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• Options to optimize lotus notes 8.5.X

  - by Jakub

  Has anyone found actually useful optimization methods for the bulky, fat, eclipse giant, nuissance that is Lotus Notes 8.5? I want it to be fast, and not eat up system resources like crazy while I run it ALL day (as it is my company's corporate mail / cal / scheduling solution). I've tried various hacks for the JVM heap size (if I recall correctly). None really bring a performance improvement. I have a dual core cpu, if that helps (I tried going the route of optimizing JAVA for 2 cores in hopes it would work, but seen no speed improvement). Notes is just sooo bloated, anyone have any suggestions to optimize/mod this thing so it is more responsive and less of a resource hog. Note: I don't want to switch to the web version, or the standard stripped down versions, I am aware of those, I just cannot since we don't run those internally for the company.

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• How to tell if PAE is hurting me?

  - by James

  I have a couple of servers with 20-30 GB RAM that are running (a variant of) RHEL4. They are currently running the SMP i386 kernel, not x64, not even the hugemem kernel. This means LowMem is confined to < 1G, and thus dentry_cache and ext3_inode_cache to 100M or so each. How can I tell if this is a problem? Here's a typical vmstat report while it's compiling some Java: $ vmstat 10 procs -----------memory---------- ---swap-- -----io---- --system-- ----cpu---- r b swpd free buff cache si so bi bo in cs us sy id wa 1 1 0 19493816 394740 922420 0 0 1058 2292 1491 1020 6 3 80 12 2 1 0 19519480 395244 850156 0 0 1179 1412 1329 1195 9 4 75 12 1 1 0 19557368 392616 828344 0 0 1783 1680 1498 1756 14 5 72 9 I don't like the way bi is nonzero when there is so much memory free. I imagine slabtop could point more directly to the problem but I don't really understand how to interpret its output.

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• How to stop a infinite running process(ztail) started by a ssh session after that session is closed

  - by Sanath Adiga

  I have a peculiar problem. My server supports multiple ssh session simultaneously, so that multiple admins can manage it simultaneously. We have a command which calls ztail to show the compressed log files and when the current ssh session is closed (without pressing ctrlc, to stop the tail command), the command should ideally stop working. But what I observed when I start a new ssh session is that the process ztail is still running in the background and consuming CPU, even though the previous session was closed. How can I determine when the session is closed, so that I can use that variable/flag to close/stop any commands initiated by that previously closed session?

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• Server freeze (Disk I/O possibly)

  - by user973917

  I have a Windows Server 2008 machine that is resyncing disks after a powerloss. The issue is that the system becomes unresponsive after about 10 minutes. We've checked with resource monitor and found that the CPU's aren't maxed; but the disk I/O is well over 250MB/s. We've attempted copying data from 1 disk to another; bypassing syncing of disks and this too causes the machine to freeze after about 10 minutes of copying data. I have attempted to let the machine resync the disks for a few days with the machine on in this "frozen" state. By frozen I mean that NOTHING works on the machine, it's completely unresponsive; no mouse movement, etc. I want to know how I would go about definitively checking if this is Disk I/O that is freezing the system. I know that disk I/O can freeze a system; but what can I use to run tests to be sure?

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• Xeon X5550 vs Six-core Opteron for database server

  - by gregmac

  I'm specing out a database server, and the price works out to be reasonably close between an Intel X5550 Quad-core and an AMD 2425HE (2.1Ghz) Six-core Opteron. I've been looking for some comparisons between the two, but the only thing useful I've found is an AnandTech Review of the 2435 which compares it to Intel Xeons, but concludes they both have their place. My load is MS SQL Server 2008, with an OLTP database that has about an equal amount of reading/writing (and it's a reasonably heavy load). So my question is, what is going to work better in this situation, assuming the drives are the same: Xeon X5550, with 16GB 1333Mhz RAM (Dell R510) or an Opteron 2425HE (2.1Ghz) or 2439SE (2.8Ghz) with 16GB of 800Mhz RAM? (Dell 2970) Note: the 2439 adds $500, but the overall pricing works out that it's not that much more than the R510. Using the 2425HE, the Dell 2970 server is slightly less than the similarly-equipped R510). If it adds a decent amount of performance, it's worthwhile to go faster. (single CPU, in both cases).

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• How does NTFS compression affect performance?

  - by DragonLord

  I've heard that NTFS compression can reduce performance due to extra CPU usage, but I've read reports that it may actually increase performance because of reduced disk reads. How exactly does NTFS compression affect system performance? Notes: I'm running a laptop with a 5400 RPM hard drive, and many of the things I do on it are I/O bound. The processor is a AMD Phenom II with four cores running at 2.0 GHz. The system is defragmented regularly using UltraDefrag. The workload is mixed read-write, with reads occurring somewhat more often than writes. The files to be compressed include personal documents and selected programs, including several (less demanding) games and Visual Studio (which tends to be I/O bound more often than not).

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