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

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Message-Id: <7412A1BC-0383-4539-BCCB-D14FB4206E1B@alex.org.uk>
Date:	Wed, 13 Feb 2013 00:00:13 +0000
From:	Alex Bligh <alex@...x.org.uk>
To:	Paolo Bonzini <pbonzini@...hat.com>
Cc:	Alex Bligh <alex@...x.org.uk>, 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

Paolo,

On 12 Feb 2013, at 18:06, Paolo Bonzini wrote:

> 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.

I think my mods to the official NBD code support FUA (albeit not very efficiently)

>>>>>> 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?


Yes. I know one well (but it's not open source). NBD seems to be the 'goto protocol' for writing distributed block store drivers in user space.

-- 
Alex Bligh




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