RE: [Xen-users] SMP, Win 2k3 R2 Server, and GPLPV

["James Harper" <james.harper@xxxxxxxxxxxxxxxx>]

> 
> On Tuesday 06 January 2009 22:58:18 James Harper wrote:
> > E200+file:+GPLPV = 320MB/min but the Dom0 would freeze after about
8GB
> > restored and the restore would fail
> >
> > E200+tap:aio+GPLPV = 12MB/min. This would probably run to completion
but
> > I wasn't going to wait
> >
> > E200+file:+qemu = 270MB/min and restored to completion
> >
> > SW RAID+tap:aio+GPLPV = 620MB/min (and everything remains responsive
the
> > entire time)
> 
> Very interesting numbers there James.
> I'm a RAID10 man myself, but there is some chunk alignment issue with
Xen,
> HVM guests (possible just windows, I didn't try), and LVM, or
something.
> 
> > Obviously something was wrong somewhere for the E200 to perform that
> > badly, but don't underestimate the performance of software raid,
> > especially RAID1 (I wouldn't recommend RAID[56] to anyone who cares
> > about performance, be it hardware or software RAID).
> 
> Heh, I've just built this new machine with RAID6 :)
> Your 620MB/min test, was that tap:aio on a file, or lvm, or ...? Might
go
> back to RAID10 and skip the LVs instead, I won't ever resize these
images.

tap:aio + lvm + RAID1

James

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