Re: 6 SCSI Disks RAID 10 x 2 SCSI DISKS RAID1 + 4 SCSI Disks RAID 10

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(dot)oliveira(at)grant(dot)co(dot)uk>
To: pgsql-admin(at)postgresql(dot)org <pgsql-admin(at)postgresql(dot)org>
Subject: [ADMIN] 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(dot)oliveira(at)grant(dot)co(dot)uk

Tel: +44 (0)1763 260811
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