Re: reconfiguring diskspace while upgrading to 8.2.5

Postgres admin team,

I posed this question last week.  Probably a bad week to ask questions as many people off

For the holidays so response was light.  Thanks to Pete Eisentraut for his feedback.

I’d like to pose the question again.  Our upgrade time-table is getting close.  Any and

All feedback would be appreciated.

Thank you,

Mark Steben

Admin team,

We are upgrading from Postgres 7.4.5 to 8.2.5 in mid January.  We are also adding new disks

As we go.  I am investigating using the new tablespace facility to move our biggest and most accessed

Table to the new disk.  Here are the statistics.  We are running RAID 10

  Current database size -------------   63 GIG

  Heavy accessed table to move:

           Table -----------------------   7.4 GIG

           2 indexes -------------------   3 GIG apiece

           2 other indexes -------------   2.5 GIG apiece

Current database disk configuration

          TOTAL space -------------- 404 GIG

           TOTAL spindles -----------      3

           TOTAL mirrors ------------      3

 New additional disk configuration

           TOTAL  space ------------   290 GIG

           TOTAL spindles -----------       2

           TOTAL mirrors   -----------      2

The choices we see are:

    1. Adding the two new spindles to the other three making one huge logical partition

        And all 350+ tables and 400+ indexes continue to reside there

    2. Keeping the two new spindles separate and dedicating the heavy access table

         And its 4 indexes to it.

    3. Keeping the two new spindles separate and dedicating the heavy access table

          To it, but keeping the 4 indexes on the old partition.

I know that maintaining almost 700 GIG of total disk space being utilized by a 63 GIG

  Database looks like disk-space overkill but we do expect massive growth over the

  Next 2 – 3 years.

Any thoughts / comments would be appreciated.

Also are there tools out there that monitor disk I/O and disk speed?

Thanks for your time,