pg.ddx.io  pgsql-performance@postgresql.org mailing list archive  

help / color / mirror / Atom feed
From: Michael Stone <mstone+postgres@mathom.us>
To: pgsql-performance@postgresql.org
Subject: Re: Bad iostat numbers
Date: Tue, 05 Dec 2006 09:49:41 -0500
Message-ID: <20061205144939.GA1622@mathom.us> (raw)
In-Reply-To: <33c6269f0612050457s4a8eb0eas662d7a50fb5dfa89@mail.gmail.com>
References: <PEEPKDFEHHEMKBBFPOOKKEHCDKAA.carlos.reimer@opendb.com.br>
	<Pine.GSO.4.64.0612032336250.19679@westnet.com>
	<33c6269f0612032317t9f0bc77n3ff791a5cd88fc80@mail.gmail.com>
	<Pine.GSO.4.64.0612041946120.9323@westnet.com>
	<33c6269f0612042221x5820e98bl96f8d0dc4a87bd3f@mail.gmail.com>
	<20061205121507.GZ1622@mathom.us>
	<33c6269f0612050457s4a8eb0eas662d7a50fb5dfa89@mail.gmail.com>

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



view thread (22+ messages)  latest in thread

Message-ID: <20061205144939.GA1622@mathom.us>
Permalink:  ../20061205144939.GA1622@mathom.us/
Also on:    postgresql.org/message-id/20061205144939.GA1622@mathom.us

 · 

reply
Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Reply to all the recipients using the --to and --cc options:
  reply via email

  To: pgsql-performance@postgresql.org
  Cc: mstone+postgres@mathom.us
  Subject: Re: Bad iostat numbers
  In-Reply-To: <20061205144939.GA1622@mathom.us>

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

This inbox is served by DDX for PostgreSQL; see mirroring instructions
for how to clone and mirror all data and code used for this inbox