On Tue, May 1, 2012 at 8:14 AM, Walker, James Les <JAWalker@xxxxxxxxxx> wrote: > SSD is OCZ-VERTEX3 MI. Controller is LSI SAS2 2008 Falcon. I'm working on installing EDB. Then I can give you some I/O numbers. It looks like the ssd doesn't have a nv cache and the raid card is a simple sas hba (which likely isn't doing much for the ssd besides masking TRIM). The OCZ 'pro' versions are the ones with power loss protection (see: http://hothardware.com/Reviews/OCZ-Vertex-3-Pro-SandForce-SF2000-Based-SSD-Preview/). Note the bullet: "Implements SandForce 2582 Controller with power loss data protection". It doesn't look like the Vertex 3 Pro is out yet. If my hunch is correct, the issue here is that the drive is being asked to sync data physically and SSD really don't perform well when the controller isn't in control of when and how to sync data. However full physical sync is the only way to guarantee data is truly safe in the context of a unexpected power loss (an nv cache is basically a compromise on this point). merlin -- Sent via pgsql-performance mailing list (pgsql-performance@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-performance
