Is RAID10 the best choice?

From: Carlos Benkendorf <carlosbenkendorf(at)yahoo(dot)com(dot)br>
To: pgsql-performance(at)postgresql(dot)org
Subject: Is RAID10 the best choice?
Date: 2005-12-10 11:34:23
Message-ID: 20051210113423.85996.qmail@web35514.mail.mud.yahoo.com
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Hello,

I would like to know which is the best configuration to use 4 scsi drives with a pg 8.1 server.

Configuring them as a RAID10 set seems a good choice but now I´m figuring another configuration:
SCSI drive 1: operational system
SCSI drive 2: pg_xlog
SCSI drive 3: data
SCSI drive 4: index

I know the difference between them when you analyze risks of loosing data but how about performance?

What should be better?

Obs.: Our system uses always an index for every access.. (enable_seqscan(false))

Thanks in advance!

Benkendorf


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