[SunHELP] qmail performance on ufs file system

[Bob C. Ruddy]

mounting with noatime gave me about a 8% increase in the speed i needed.
the logging then took performance away. I got a large perf increase though
from stripping this file system. Thanks for the input

Bob

On Tue, 19 Jun 2001, Jonathan Fortin wrote:

->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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