I think it's better to put all disk in a RAID10. Your max throughput with 6 disks will be a 50% better that with 4 disks, and operating system once booted, does not have to read/write but a few times.
I would divide RAID volume in several partitions: at least, operating system (/), swap and database (/srv/database) and better another for homes (/homes). Optionally, another one for logfiles (/var/log).
That's my suggestion. Perhaps somebody has another point of view, but I prefer to rely in RAID controller and not in putting database stuff in separated disks.
-----Original Message-----
From: Renato Oliveira <renato.oliveira@xxxxxxxxxxx>
To: pgsql-admin@xxxxxxxxxxxxxx <pgsql-admin@xxxxxxxxxxxxxx>
Subject: 6 SCSI Disks RAID 10 x 2 SCSI DISKS RAID1 + 4 SCSI Disks RAID 10
Date: Thu, 6 May 2010 14:10:49 +0100
Good afternoon Guys,
I have been reading about RAID for PostgreSQL and some suggestions are:
6 SCSI Disks RAID10 for OS and DB
Or
2 SCSI Disks RAID 1 for OS + 4 SCSI RAID 10 for DB
I know the more spindles you have the better, but if you are going to be reading and writing to the same volume with a single controller, how good that will be?
How do you guys have your RAIDS setup?
Thank you
Renato
Renato Oliveira
Systems Administrator
e-mail: renato.oliveira@xxxxxxxxxxx
Tel: +44 (0)1763 260811
Fax: +44 (0)1763 262410
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