Re: Solid State Disks for Databases
- From: Niall Litchfield <niall.litchfield@xxxxxxxxx>
- To: DGoulet@xxxxxxxx
- Date: Tue, 27 Sep 2005 19:52:40 +0100
On 9/27/05, Goulet, Dick <DGoulet@xxxxxxxx> wrote:
>
> Hemant,
>
> Yes they appear to be much faster than normal disks, but they
> are also substantially, like a factor of 3 or 4 times, more expensive as
> well. We use EMC Symetrix systems and right now we can get 72GB mirrored
> for about $5,000. Soliddata's E75 is roughly the same price and only
> has 2GB of space.
>
See Cary's excellent, as usual, post on not spending money where it makes
almost no difference.
Where I suspect a number of systems may benefit is in alleviating the redo
bottleneck. (This is of course detectable by looking in the right place).
redo is often a bottleneck on heavy transactional systems (especially those
that have more transactions than they should, and ssd for redo and maybe
archives *might* help.
ps. $5000 for 72gb seems to come from a vendor that sells Redundant Arrays
of Inordinately expensive Disks. Is the performance and reliability really
better than say http://www.apple.com/xserve/raid/ ?
--
Niall Litchfield
Oracle DBA
http://www.niall.litchfield.dial.pipex.com
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