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Re: [Qemu-devel] [PATCH 1/5] RFC: Efficient VM backup for qemu (v1)


From: Stefan Hajnoczi
Subject: Re: [Qemu-devel] [PATCH 1/5] RFC: Efficient VM backup for qemu (v1)
Date: Fri, 23 Nov 2012 06:25:11 +0100

On Fri, Nov 23, 2012 at 6:23 AM, Stefan Hajnoczi <address@hidden> wrote:
> On Thu, Nov 22, 2012 at 6:46 PM, Dietmar Maurer <address@hidden> wrote:
>>> > Did you look at the VMDK "Stream-Optimized Compressed" subformat?
>>>
>>> We've gone down several sub-threads discussing whether VMDK is suitable.
>>> I want to summarize why this is a good approach:
>>>
>>> The VMDK format already allows for out-of-order data and is supported by
>>> existing tools - this is very important for backups where people are
>>> (rightfully) paranoid about putting their backups in an obscure format.  
>>> They
>>> want to be able to access their data years later, whether your tool is still
>>> around or not.
>>
>> The VMDK format has strong disadvantages:
>>
>> - unclear License (the spec links to patents)
>
> I've already pointed out that you're taking an inconsistent position
> on this point.  It's FUD.
>
>> - they use a very slow compression algorithm (deflate), which makes it 
>> unusable for backup
>
> I've already pointed out that we can optionally support other algorithms.

To make progress here I'll review the RFC patches.  VMDK or not isn't
the main thing, a backup feature like this looks interesting.

Stefan



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