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seen Oct 19 '13 at 23:33

Feb
14
accepted Linux high load with ImageMagick convert utility and server freezes (blktrack output attached)
Feb
3
awarded  Supporter
Jan
31
asked Linux process swap usage is greater than the overall system swap usage
Jan
27
comment Linux high load with ImageMagick convert utility and server freezes (blktrack output attached)
Also one question that as both drives are in raid, so why sdb is showing more load than sda? as both devices should have same I/O requests.
Jan
27
comment Linux high load with ImageMagick convert utility and server freezes (blktrack output attached)
And these are the results from hdparm test: pastebin.com/kpNcjJkB
Jan
27
comment Linux high load with ImageMagick convert utility and server freezes (blktrack output attached)
Thanks for your response, here's the information about both disks in raid: pastebin.com/fhqrR7N1 - Looking forward to hear from you on disks.
Jan
26
comment Linux high load with ImageMagick convert utility and server freezes (blktrack output attached)
Thanks for your response, it's causing the server to crash occasionally as sometimes the load goes over 100%, so the server at the end needs a hard reboot to get back to normal. I don't know how I can fix this high load problem.
Jan
26
revised Linux high load with ImageMagick convert utility and server freezes (blktrack output attached)
added 12 characters in body
Jan
26
revised Linux high load with ImageMagick convert utility and server freezes (blktrack output attached)
edited title
Jan
26
asked Linux high load with ImageMagick convert utility and server freezes (blktrack output attached)
Jan
26
comment CentOS server high load and server freezes
and output from sar: pastebin.com/jnVSViq6
Jan
26
comment CentOS server high load and server freezes
I've hit the problem again, here's how the machine looked like when it happened, 1) top output: pastebin.com/7ph6B5Hp 2) iostat output: pastebin.com/T1gzLHk3, 3) this time there was not output from dmesg.
Jan
26
comment CentOS server high load and server freezes
It's a real machine, the machine is used to run imagemagick software to convert images, so more writes are done. When the load goes high, at times I've seen all the four cores of the CPU waiting for I/O and not doing anything, but I'm unable to find exactly what is causing those I/O blocks, following is the output from iostat, however I've still not seen this issue happened that's why the load seems normal at the moment:
Jan
25
comment CentOS server high load and server freezes
The schedular and queue depth values are: # cat /sys/block/sd{a,b}/{device,queue}/{queue_depth,scheduler} 2>/dev/null 1 noop anticipatory deadline [cfq] 1 noop anticipatory deadline [cfq] I'm waiting for it to happen again and will post iostat data as well, meanwhile if you could guess the cause of problem from schedular/queue depth, that would be helpful Thanks
Jan
24
awarded  Editor
Jan
24
revised CentOS server high load and server freezes
edited title
Jan
24
asked CentOS server high load and server freezes
Jan
5
awarded  Scholar
Jan
5
accepted Server freezes and suddenly load going very high
Dec
27
awarded  Student