Re: Tuning PostgreSQL

>>>>> "AP" == Alexander Priem <ap(at)cict(dot)nl> writes:

AP> Hmmm. I keep changing my mind about this. My Db would be mostly
AP> 'selecting', but there would also be pretty much inserting and
AP> updating done. But most of the work would be selects. So would
AP> this config be OK?

I'm about to order a new server. I haven't decided exactly how many
disks I will get, but my plan is to get an 8-disk RAID10 with 15k RPM
drives. I don't need the volume, just the speed and number of
spindles, so I'm buying the smallest drives that meet my speed
probably 18Gb each (sheesh! I remember getting my first 5Mb disk for
my 8088 PC in college and thinking that was too much space).

My mix is nearly even read/write, but probably a little biased towards
the reading.

This machine is replacing a 5-disk box that was switched from RAID5 to
4-disk RAID10 for data plus one system disk in January (what a pain
that was to re-index, but that's another story). The switch from
RAID5 to RAID10 made an enormous improvement in performance. The
speedup wasn't from recreating the database: It was restored from a
file-level backup so the actual files were not compacted or secretly
"improved" in any way, other than my occasional reindexing.

So I think your 6-disk RAID10 will be good.

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