Niall, That's 72GB of usable mirrored disk, which really comes to something like 150GB. And yes, EMC is expensive. _____ From: Niall Litchfield [mailto:niall.litchfield@xxxxxxxxx] Sent: Tuesday, September 27, 2005 2:53 PM To: Goulet, Dick Cc: hkchital@xxxxxxxxxxxxxx; Oracle-L Subject: Re: Solid State Disks for Databases 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