[linux-lvm] Re: lvm2 performance data with linux-2.6

[Chris Croswhite]

Is this generally available to all?  Where can it be had?

TIA

On Thu, 2004-03-11 at 14:25, Mark Wong wrote:
> On Thu, Mar 11, 2004 at 05:12:35PM -0500, Bill Davidsen wrote:
> > markw at 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.
> 
> Thanks,
> Mark
> 
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