[CentOS] Re: Native Command Queueing
ssilva at sgvwater.com
Thu Jul 24 23:42:11 UTC 2008
on 7-24-2008 4:21 PM Matt spake the following:
>>> 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.
> 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
> Average: all 14.13 0.00 3.12 14.85 67.90
User and IOwaits are a little high. Not going to stop the server, but it stops
it from hitting its full potential.
How many users?
I have a server with about 80 users and my averages are;
Average: all 6.00 0.00 3.65 3.95 86.40
That is with 2 dualcore XEON's at 2.2 Gh and 4 gigs and a SATA raid 5 (3ware)..
It was on a single drive for a month or so after a recovery and I had IOwaits
like yours. System was sluggish. Users whined. It wasn't pretty. The single
drive was the fastest recovery while I had to replace some drives that tanked.
I have a spare, but not 3.
MailScanner is like deodorant...
You hope everybody uses it, and
you notice quickly if they don't!!!!
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