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.
--
john r pierce N 37, W 122
santa cruz ca mid-left coast