Vivek,
Was there anything specific that helped you decide on a RAID-5 and not a RAID-10?
I have my DBs on RAID10, and would soon be moving them on FC drives, and i am considering RAID-10.
Thanks,
Anjan
-----Original Message-----
From: Josh Berkus [mailto:josh@agliodbs.com]
Sent: Tue 3/2/2004 4:27 PM
To: Vivek Khera; pgsql-performance@postgresql.org
Cc:
Subject: Re: [PERFORM] Database Server Tuning
Vivek,
> I did a bunch of testing with different RAID levels on a 14 disk
> array. I finally settled on this: RAID5 across 14 disks for the
> data, the OS (including syslog directory) and WAL on a RAID1 pair on
> the other channel of the same controller (I didn't want to spring for
> dual RAID controllers). The biggest bumps in performance came from
> increasing the checkpoint_buffers since my DB is heavily written to,
> and increasing sort_mem.
With large RAID, have you found that having WAL on a seperate array actually
boosts performance? The empirical tests we've seen so far don't seem to
support this.
--
-Josh Berkus
Aglio Database Solutions
San Francisco
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