I would be very cautious about ever using RAID5, despite manufacturers' claims 
to the contrary. The link below is authored by a very knowledgable fellow whose 
posts I know (and trust) from Informix land.


Greg Williamson
GlobeXplorer LLC

-----Original Message-----
From:   [EMAIL PROTECTED] on behalf of Anjan Dave
Sent:   Mon 8/15/2005 1:35 PM
To:     pgsql-performance@postgresql.org
Subject:        [PERFORM] choosing RAID level for xlogs


One simple question. For 125 or more checkpoint segments
(checkpoint_timeout is 600 seconds, shared_buffers are at 21760 or
170MB) on a very busy database, what is more suitable, a separate 6 disk
RAID5 volume, or a RAID10 volume? Databases will be on separate
spindles. Disks are 36GB 15KRPM, 2Gb Fiber Channel. Performance is
paramount, but I don't want to use RAID0.


PG7.4.7 on RHAS 4.0


I can provide more info if needed.


Appreciate some recommendations!





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