Re: Bad iostat numbers - Mailing list pgsql-performance

From Michael Stone
Subject Re: Bad iostat numbers
Date
Msg-id 20061205144939.GA1622@mathom.us
Whole thread Raw
In response to Re: Bad iostat numbers  ("Alex Turner" <armtuk@gmail.com>)
List pgsql-performance
On Tue, Dec 05, 2006 at 07:57:43AM -0500, Alex Turner wrote:
>The problem I see with software raid is the issue of a battery backed unit:
>If the computer loses power, then the 'cache' which is held in system
>memory, goes away, and fubars your RAID.

Since the Adaptec doesn't have a BBU, it's a lateral move. Also, this is
less an issue of data integrity than performance; you can get exactly
the same level of integrity, you just have to wait for the data to sync
to disk. If you're read-mostly that's irrelevant.

Mike Stone

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