| From: | Alvaro Herrera <alvherre(at)commandprompt(dot)com> |
|---|---|
| To: | Kevin Grittner <Kevin(dot)Grittner(at)wicourts(dot)gov> |
| Cc: | Jesper Krogh <jesper(at)krogh(dot)cc>, pgsql-performance(at)postgresql(dot)org |
| Subject: | Re: moving pg_xlog -- yeah, it's worth it! |
| Date: | 2010-02-11 17:57:52 |
| Message-ID: | 20100211175752.GB3145@alvh.no-ip.org |
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| Thread: | |
| Lists: | pgsql-performance |
Kevin Grittner wrote:
> Another example of why I shouldn't trust my memory. Per the
> hardware tech:
>
>
> OS: /dev/sda is RAID1 - 2 x 2.5" 15k SAS disk
> pg_xlog: /dev/sdb is RAID1 - 2 x 2.5" 15k SAS disk
>
> These reside on a ServeRAID-MR10k controller with 256MB BB cache.
>
>
> data: /dev/sdc is RAID5 - 30 x 3.5" 15k SAS disk
>
> These reside on the DS3200 disk subsystem with 512MB BB cache per
> controller and redundant drive loops.
Hmm, so maybe the performance benefit is not from it being on a separate
array, but from it being RAID1 instead of RAID5?
--
Alvaro Herrera http://www.CommandPrompt.com/
PostgreSQL Replication, Consulting, Custom Development, 24x7 support
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