linux-kernel - Re: [PATCH 1/3] nbd: support FLUSH requests

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Message-ID: <511A8491.5030407@redhat.com>
Date:	Tue, 12 Feb 2013 19:06:09 +0100
From:	Paolo Bonzini <pbonzini@...hat.com>
To:	Alex Bligh <alex@...x.org.uk>
CC:	linux-kernel@...r.kernel.org, nbd-general@...ts.sf.net,
	Paul Clements <Paul.Clements@...eleye.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH 1/3] nbd: support FLUSH requests

Il 12/02/2013 18:37, Alex Bligh ha scritto:
> For my education, why remove the FUA stuff?

Because I had no way to test it.

>>> > > Hmmm... the underlying storage could be md/dm RAIDs in which case FUA
>>> > > should be cheaper than FLUSH.
>> > 
>> > If someone ever wrote a virtio-blk backend that sits directly ontop
>> > of the Linux block layer that would be true.
> In this case we don't know what the backend is sitting on top of
> a-priori. It might be the current nbd server code, but it might
> not be.

Do you know of any other NBD server than the "official" one and qemu-nbd?

Paolo
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