Re: Tuning PostgreSQL

>>>>> "GS" == Greg Stark <gsstark@mit.edu> writes:

GS> "scott.marlowe" <scott.marlowe@ihs.com> writes:

GS> But you have to actually test your setup in practice to see if it
GS> hurts. A big data warehousing system will be faster under RAID5
GS> than under RAID1+0 because of the extra disks in the
GS> stripeset. The more disks in the stripeset the more bandwidth you
GS> get.

Anyone have ideas on 14 spindles?  I just ordered a disk subsystem
with 14 high speed (U320 15kRPM) SCSI disks to hook up with a dell
PERC3/DC controller (only 128MB cache, though).

My plan was to do RAID10, but I think I'll play with RAID5 again and
see which gives me the best performance.  Unfortunatly, it is
difficult to recreate the highly fragmented tables I have now (vacuum
full takes over 14 hours on one of the tables) so I'm not sure how to
best compare them.

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