[CentOS] Re: Native Command Queueing
John R Pierce
pierce at hogranch.com
Thu Jul 24 23:52:31 UTC 2008
>>> I was monitoring it with SAR and there was very high level of IOWait, meaning the drive was having a hard time.
> How bad does the below look? Dual core AM2 5600+ with 4G DDR2 and
> single SATA2 drive.
> 10:10:01 AM all 20.54 0.00 4.09 15.85 59.52
> 05:40:01 PM CPU %user %nice %system %iowait %idle
> 05:50:01 PM all 7.20 0.00 2.49 5.08 85.23
use `iostat -x 5` for 5 second intervals with a lot more detail on disk
IO operations. ignore the first output sample, thats the average since
last boot.. iostat is part of the sysstat package, yum install
sysstat, if you don't already have it.
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