Messages in this thread | | | Date | Thu, 11 Mar 2004 14:25:15 -0800 | From | Mark Wong <> | Subject | Re: lvm2 performance data with linux-2.6 |
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On Thu, Mar 11, 2004 at 05:12:35PM -0500, Bill Davidsen wrote: > markw@osdl.org wrote: > > I've started collecting various data (including oprofile) using our > > DBT-2 (OLTP) workload with lvm2 on linux 2.6.2 and 2.6.3 on ia32 and > > ia64 platforms: > > http://developer.osdl.org/markw/lvm2/ > > > > So far I've only varied the stripe width with lvm, from 8 KB to 512 KB, > > for PostgreSQL that is using 8 KB sized blocks with ext2. It appears > > that a stripe width of 16 KB through 128KB on the ia64 system gives the > > best throughput for the DBT-2 workload on a volume that should be doing > > mostly sequential writes. > > > > I'm going to run through more tests varying the block size that > > PostgreSQL uses, but I wanted to share what I had so far in case there > > were other suggestions or recommendations. > > > Here's one thought: look at the i/o rates on individual drives using > each stripe size. You *might* see that one size does far fewer seeks > than others, which is a secondary thing to optimize after throughput IMHO. > > If you don't have a tool for this I can send you the latest diorate > which does stuff like this, io rate perdrive or per partition, something > I occasionally find revealing.
Yeah, please do send me a copy. I'd be interested to see what that might turn up. I've just been using iostat -x so far.
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