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Re: [Xen-users] GPLPV and LUN's on a storage

To: Klaus Steinberger <klaus.steinberger@xxxxxxxxxxxxxxxxxxxxxx>
Subject: Re: [Xen-users] GPLPV and LUN's on a storage
From: Pasi Kärkkäinen <pasik@xxxxxx>
Date: Tue, 27 Oct 2009 11:28:16 +0200
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On Tue, Oct 27, 2009 at 07:35:22AM +0100, Klaus Steinberger wrote:
> >Do you use phy:, file: or tap:aio: ? 
> phy:

Ok. Hmm.. that should be safe.

The pygrub problem is most probably different issue, since with pygrub
you have two different programs accessing the same storage: domU with
for example phy: driver, and then the dom0 userspace pygrub using normal
non-direct calls, which causes the problem.

Redhat fixed pygrub by making pygrub use O_DIRECT to bypass dom0 kernel

What's your dom0 OS/kernel/Xen? RHEL5.4?

-- Pasi

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