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reconfiguring diskspace while upgrading to 8.2.5

From: "Mark Steben" <msteben(at)autorevenue(dot)com>
To: <pgsql-admin(at)postgresql(dot)org>
Cc: <rich(at)autorevenue(dot)com>,"'David Parks'" <dparks(at)autorevenue(dot)com>,"'Craig Brothers'" <cbrothers(at)autorevenue(dot)com>
Subject: reconfiguring diskspace while upgrading to 8.2.5
Date: 2007-12-28 15:08:41
Message-ID: 002401c84963$87fc54b0$14010a0a@dei26g028575 (view raw, whole thread or download thread mbox)
Lists: pgsql-admin
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

         And its 4 indexes to it.

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

          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,      


Mark Steben

Senior Database Administrator
A Dominion Enterprises Company
480 Pleasant Street
Suite B200
Lee, MA 01238
413-243-4800 Home Office 
413-243-4809 Corporate Fax

msteben <blocked::mailto:name(at)autorevenue(dot)com>

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