On Tue, Nov 17, 2009 at 1:51 PM, Greg Smith <greg@xxxxxxxxxxxxxxx> wrote: > Merlin Moncure wrote: >> >> I am right now talking to someone on postgresql irc who is measuring >> 15k iops from x25-e and no data loss following power plug test. > > The funny thing about Murphy is that he doesn't visit when things are quiet. > It's quite possible the window for data loss on the drive is very small. > Maybe you only see it one out of 10 pulls with a very aggressive > database-oriented write test. Whatever the odd conditions are, you can be > sure you'll see them when there's a bad outage in actual production though. > > A good test program that is a bit better at introducing and detecting the > write cache issue is described at http://brad.livejournal.com/2116715.html Sure, not disputing that...I don't have one to test myself, so I can't vouch for the data being safe. But what's up with the 400 iops measured from bonnie++? That's an order of magnitude slower than any other published benchmark on the 'net, and I'm dying to get a little clarification here. merlin -- Sent via pgsql-performance mailing list (pgsql-performance@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-performance
