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    SubjectRe: [linux-lvm] Re: lvm2 performance data with linux-2.6
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    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@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
    >
    > _______________________________________________
    > linux-lvm mailing list
    > linux-lvm@redhat.com
    > https://www.redhat.com/mailman/listinfo/linux-lvm
    > read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/

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