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From: Ben Carter (bhc plus at pitt dot edu)
Date: Wed Apr 19 2006 - 15:06:44 EDT
Michael Loftis wrote:
>
>
> --On April 19, 2006 12:47:26 PM -0500 John Wade <> wrote:
>
>> We run cyrus on RedHat on a CX600. For our administrative users, we put
>> the whole thing on a nine disk fibre channel RAIDgroup, split into 6
>> luns, 5 for mail spool partitions and 1 for all the other metadata.
>> Total mail spool size is 300GB. We average about 300 concurrent
>> users. The CX600 is heavily used by other applications. I/O
>> performance has never been an issue as far as I can tell. The large
>> write caches in the CX600 solve the write problem and the host memory
>> caching seems to solve the read problem. Your mileage may vary. We
>> couldn't do a direct cyrus SAN performance comparision because when we
>> moved to this box, we migrated to the SAN and new server hardware at the
>> same time, but tests on other systems where we just moved storage on to
>> the array saw a huge performance boost vs. locally attached SCSI RAID 5
>> storage with no write cache enabled.
>
If you're really building 9-disk RAID 5 RAID groups, you might see a
pretty big performance hit on a drive failure - until the data has been
rebuilt on the hot spare of course. You might want to test this before
going this way.
-- Ben Carter University of Pittsburgh/CSSD 412-624-6470 ---- Cyrus Home Page: http://asg.web.cmu.edu/cyrus Cyrus Wiki/FAQ: http://cyruswiki.andrew.cmu.edu List Archives/Info: http://asg.web.cmu.edu/cyrus/mailing-list.html
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