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

[Mike Williams <mike@xxxxxxxxxxx>]

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.

Nick, James, would you mind sharing your xen configs for 2 vpcu win2k3 domUs 
please?

Thanks

-- 
Mike Williams

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