| From: | Douglas McNaught <doug(at)mcnaught(dot)org> |
|---|---|
| To: | Himanshu Baweja <himanshubaweja(at)yahoo(dot)com> |
| Cc: | pgsql-general(at)postgresql(dot)org |
| Subject: | Re: Tablespaces across same raid... |
| Date: | 2005-06-27 13:29:56 |
| Message-ID: | m2aclc6i7f.fsf@Douglas-McNaughts-Powerbook.local |
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| Lists: | pgsql-general |
Himanshu Baweja <himanshubaweja(at)yahoo(dot)com> writes:
> i just have one raid controller with 6 disks
> attached... i see all of it as single drive with three
> partitions create by me...
>
> will creating tablespaces help me.... also is there a
> way i can say this table to this disk???
In a RAID, all data goes across all disks, so in your case the answer
is no. I doublt tablespaces would help, because again all data goes
across all disks.
What you might consider, if you can break up the RAID, is to use two
disks for a mirrored pair (RAID-1). Put the WAL logs (the pg_xlog
directory) on that volume. Then make a RAID-5 with the other four
disks for the rest of the database. The pg_xlog directory is
constantly written to so having it on independent disks is very
helpful with performance.
-Doug
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