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
Comments appreciated.
--
Craig Ringer
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