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Message-ID: <46D5CEDD.5010303@mark.mielke.cc>
Date: Wed, 29 Aug 2007 15:54:05 -0400
From: Mark Mielke <mark@mark.mielke.cc>
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To: mbguy2000-1@yahoo.com
CC: pgsql-performance@postgresql.org
Subject: Re: Transaction Log
References: <782718.73151.qm@web31603.mail.mud.yahoo.com>
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mbguy2000-1@yahoo.com wrote:
> For best performance, the transaction log should be on a separate disk.
>
> Does the writing of the log benefit from a battery backed controller 
> as well?  If not, what do people think about writing the transaction 
> log to a flash card or the like?
How popular are the battery backed RAM drives that exist today? I don't 
recall seeing them spoken about in this mailing list. The local geek 
shop has these devices on sale. Are they still too expensive?

For those that don't know what I am talking about - they are PCI devices 
that present themselves as a hard drive, but are filled with commodity 
RAM instead of a magnetic platter, and a battery that lasts a few weeks 
without external power.

Cheers,
mark

-- 
Mark Mielke <mark@mielke.cc>


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<a class="moz-txt-link-abbreviated" href="mailto:mbguy2000-1@yahoo.com">mbguy2000-1@yahoo.com</a> wrote:
<blockquote cite="mid:782718.73151.qm@web31603.mail.mud.yahoo.com"
 type="cite">
  <style type="text/css"><!-- DIV {margin:0px;} --></style>
  <div style="font-family: arial,helvetica,sans-serif; font-size: 12pt;">
  <div>For best performance, the transaction log should be on a
separate disk.<br>
  <br>
Does
the writing of the log benefit from a battery backed controller as
well?&nbsp; If not, what do people think about writing the transaction log
to a flash card or the like?</div>
  </div>
</blockquote>
How popular are the battery backed RAM drives that exist today? I don't
recall seeing them spoken about in this mailing list. The local geek
shop has these devices on sale. Are they still too expensive?<br>
<br>
For those that don't know what I am talking about - they are PCI
devices that present themselves as a hard drive, but are filled with
commodity RAM instead of a magnetic platter, and a battery that lasts a
few weeks without external power.<br>
<br>
Cheers,<br>
mark<br>
<br>
<pre class="moz-signature" cols="72">-- 
Mark Mielke <a class="moz-txt-link-rfc2396E" href="mailto:mark@mielke.cc">&lt;mark@mielke.cc&gt;</a>
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