[SunHELP] qmail performance on ufs file system

[Jonathan Fortin]

Set each ufs filesystem in /etc/vfstab the mount options noatime and
logging.

the latter will give you a big boost, you won't have any more problems,
trust me.

If you got more problems after this, Ill suggest you something else for now,
try these.




----- Original Message -----
From: "Bob Ruddy" <ruddy at udlug.org>
To: <sunhelp at sunhelp.org>
Sent: Tuesday, June 19, 2001 6:45 PM
Subject: [SunHELP] qmail performance on ufs file system


> Ok on my first day at the new job they have me help trouble shoot a brand
> new qmail install....
>
> Quick look at iostat while testing the system shows the bottle neck is
> /var/qmail/queue which is where each message gets written as a seperate
file
> as soon as it is received. To test my therory i mounted that onto tmpfs so
> esentially that file system is in memory. I was correct. That was our
bottle
> neck. As throughput went way up and iowait was almost zero.
>
> The setup these boxes have is solaris7. Running on a 220 with 2 gigs of
ram
> and 2 450mhz procs. The two internal disks are mirrored. The queue is on a
> mirrored slice.
>
> So see how much mirroring cost i unmirrored the /var/qmail/queue file
> system. Instead of my throughput being 400 messages for five minutes it is
> now approx 600. So that is better but not optimal yet.
>
> The three questions I have for this group are this. What I need to
optimize
> is reading and writing small files ~ 1k fast.
>
> 1) what will vxfs buy me?
> 2) how much will the tuning of ufs get me?
> 3) where is a good resource for tuning ufs?
>
> Thanks for you help,
> Bob
>
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