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WHM's suspension cause high load




Posted by Peter-SexyWing, 03-17-2008, 09:52 PM
Hi We have a Dual opteron 275+4G ram box. PHP4+EA+CentOS+Cpanel installed Normally, load is 2 as long as we do not perform any action on WHM However, whenever we create/suspend/terminate an account , load burst to 25 and then httpd goes down Admins say it is hardware issues, which does not sound right to me have you guys got any clues on this wield issue? cheers

Posted by page-zone, 03-17-2008, 09:58 PM
I've never seen that happen. You would have to post a copy of TOP output. Sounds to me like it might be iowait skyrocketing, and would be a hardware problem. What is the RAID setup (if any)

Posted by Peter-SexyWing, 03-17-2008, 09:59 PM
here you go top - 09:58:31 up 10 days, 12:46, 1 user, load average: 2.23, 2.78, 3.24 Tasks: 173 total, 1 running, 171 sleeping, 0 stopped, 1 zombie Cpu(s): 3.2%us, 1.9%sy, 9.9%ni, 80.8%id, 4.0%wa, 0.0%hi, 0.2%si, 0.0%st Mem: 4141628k total, 3476140k used, 665488k free, 116332k buffers Swap: 2096472k total, 88k used, 2096384k free, 2452932k cached

Posted by page-zone, 03-17-2008, 10:01 PM
I mean when the load is at 25 Check this item - '4.0%wa'

Posted by Peter-SexyWing, 03-17-2008, 10:09 PM
alright, will check it when we need to do anything

Posted by page-zone, 03-17-2008, 10:14 PM
My suspicion is a huge bottleneck in writing to the hard drive(s). Even a load of 2-3 on the server which is basicly doing nothing is suspicious that that is the case. Is it a RAID5?

Posted by Peter-SexyWing, 03-17-2008, 10:20 PM
nope, there is no raid on server It is SATA HD, should not be so weak though...

Posted by Peter-SexyWing, 03-17-2008, 10:32 PM
top - 10:31:39 up 10 days, 13:19, 1 user, load average: 2.27, 2.19, 2.36 Tasks: 221 total, 5 running, 216 sleeping, 0 stopped, 0 zombie Cpu(s): 0.0%us, 24.4%sy, 3.5%ni, 20.9%id, 51.0%wa, 0.0%hi, 0.2%si, 0.0%st gee...high to 50%

Posted by page-zone, 03-17-2008, 10:34 PM
Maybe try this and check the output: hdparm -tT /dev/sda It will do a basic hard drive test Example output: /dev/sda: Timing cached reads: 2972 MB in 2.00 seconds = 1486.97 MB/sec Timing buffered disk reads: 290 MB in 3.01 seconds = 96.30 MB/sec

Posted by Peter-SexyWing, 03-17-2008, 10:38 PM
dev/sda: Timing cached reads: 3848 MB in 2.00 seconds = 1925.76 MB/sec Timing buffered disk reads: 70 MB in 3.10 seconds = 22.62 MB/sec

Posted by page-zone, 03-17-2008, 10:45 PM
That's not too bad. But I've never seen that happen just by terminating an account. Maybe check the message log: tail -f /var/log/messages If you see a lot of hardware errors there's something wrong. Or rather than sit watching the log you could do this: grep error /var/log/messages

Posted by Peter-SexyWing, 03-17-2008, 10:51 PM
em...provider suggested me to increase query cache of mysql, Iwill see how it goes pretty wield...

Posted by Peter-SexyWing, 03-17-2008, 10:57 PM
tested increasing ram, no works....

Posted by Peter-SexyWing, 03-17-2008, 11:06 PM
I found that IO wait burst when proeeding quotaon -a do we have to run this everytime suspending? if not, how to disable it?

Posted by page-zone, 03-17-2008, 11:11 PM
Maybe run /scripts/fixquotas but yes, the closer you keep WHM to stock, the easier. You can turn quotas off in WHM (I think) but no one will have a disc space limit. This post might help: http://forums.cpanel.net/showthread.php?t=67327 But my servers all run fine with quotas being on /var partition. Last edited by page-zone; 03-17-2008 at 11:22 PM.

Posted by Peter-SexyWing, 03-17-2008, 11:52 PM
this is a great info thanks so much for this, i will let admins look into it



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