On Sun, Oct 14, 2012 at 11:26:40AM +0800, Craig Ringer wrote:
> On 10/14/2012 11:00 AM, John R Pierce wrote:
> >On 10/13/12 7:13 PM, Craig Ringer wrote:
> >>
> >>* Use a good quality hardware RAID controller with a battery backup
> >>cache unit if you're using spinning disks in RAID. This is as much for
> >>performance as reliability; a BBU will make an immense difference to
> >>database performance.
> >
> >a comment on this one.... I have some test servers with lots of SAS
> >and/or SATA drives on controllers like LSI Logic 9261-8i, with 512MB or
> >1GB battery-backed cache. I can configure the controller for JBOD
> >and use linux mdraid raid10 and get the same performance as the
> >controllers native raid10, as long as the write-back cache is
> >enabled. disable the writeback cache, and you might as well be using
> >SATA JBOD.
>
> Yeah, without the write-back cache you don't gain much. I run a
> couple of DBs on plain old `md` RAID and I'm actually quite happy
> with it.
>
> I've expanded this into a blog post and improved that section there.
>
> http://blog.ringerc.id.au/2012/10/avoiding-postgresql-database-corruption.html
Craig, that is a great post. Can you get it on Planet Postgres?
http://planet.postgresql.org/
I think you would have to subscribe your RSS blog feed.
--
Bruce Momjian <bruce@momjian.us> http://momjian.us
EnterpriseDB http://enterprisedb.com
+ It's impossible for everything to be true. +
