Re: Database Server Tuning

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(at)agliodbs(dot)com]
Sent: Tue 3/2/2004 4:27 PM
To: Vivek Khera; pgsql-performance(at)postgresql(dot)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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