On Mon, 12 Aug 2013 16:05:04 -0400
Bruce Momjian <bruce@momjian.us> wrote:
> On Mon, Aug 12, 2013 at 08:33:04AM -0700, Joshua D. Drake wrote:
> > Put the pg_xlog on spindles, they are more than fast enough and
> > won't eat up the write life of your SSDs.
> Given its small size and need for fast fsync, I have WAL on SSDs, and
> the data on magnetic disk. You are right the WAL can generate a lot
> of writes, but just use smartctl monitoring and replace the SSD when
> needed.
:-) Nothing like consensus from Pg luminaries. :)
Anyway, I've decided to go with spinning disks for this server upgrade. The
factors behind my decision:
o A server with 16 10Krpm disks will be substantially better than what we
have now, and what we have now is managing to keep up with only occasional
over-busy periods.
o My supplier cannot easily get the 320, 710 or S3700 Intel SSD disks; he
claims a shortage of Intel SSD drives. I know too little about non-Intel
SSDs to feel comfortable with them.
o One of our two database servers is 200km away, so swapping out SSDs on
a prophylactic basis is not particularly appetizing.
Regards,
David.