Josh Berkus wrote:
Anjan,
Has anyone designed/implemented postgresql server on storage networks?
Yes, Zapatec.com runs their stuff this way. Probably others as well.
Are there any design considerations?
I don't know. Probably.
Are there any benchmarks for storage products (HBAs, Switches, Storage
Arrays)?
Not specific to PostgreSQL.I'm sure there are generic benchmarks. Keep
in mind that PostgreSQL needs lots of 2-way I/O, batch writes, and random
reads.
Any recommendation on the design, resources, references, keeping PG in
mind?
See above. Also keep in mind that PostgreSQL's use of I/O should improve
100% in version 7.5.
We run PG on a SAN array. We currently have it setup so a single PG
instance runs off of a single LUN, this includes the WAL logs. Apart
from that we have made no other special considerations; we just treat it
as a fast RAID array. We haven't got to the stage where the speed of the
SAN is a problem as load hasn't increased as expected. This will change,
when it does I am sure the performance list will be hearing from us ;-).
Out current limitations, as I see it, are amount of memory and then
processing power. The only problem we have had was a dodgy set of kernel
modules (drivers) for the fibre cards, this was because they were beta
drivers and obviously still had a few bugs. This was solved by reverting
to an older version. Everything has run smoothly since then (uptime is
153 days :-)).
Nick
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