On Mon, Sep 20, 2010 at 2:54 PM, George Sexton <georges@xxxxxxxxxxxxxx> wrote: > I'll throw in my 2 cents worth: > > 1) Performance using RAID 1 for reads sucks. You would expect throughput to > double in this configuration, but it doesn't. That said, performance for > RAID 1 is not noticeably worse than Linux MD. My testing showed the 3Ware > controller to be about 20% faster than Linux MD for RAID 1. No performance improvement is expected for streaming reads in any non-striped RAID1. Random reads should nearly double in throughput. You can use Linux's software RAID10 module to improve streaming reads of a "mirror" using the "far" layout which in effect stripes the data across 2 disks at the expense of some hit in streaming write performance. Testing is required to determine if this tradeoff works for your workload or not. -Dave -- Sent via pgsql-performance mailing list (pgsql-performance@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-performance
