Re: XCP: RFC: compressing VM exports by default

[David Markey <admin@dmarkey.com>]

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Hmm could increase Dom0 load during an export.

I think its a good idea overall however.

On 22 June 2010 15:08, Dave Scott <Dave.Scott@eu.citrix.com> wrote:

> Hi,
>
> In XCP a VM "export" is a serialized VM, including metadata and usually raw
> disk blocks. The format is a very simple tar file (really stream) with an
> XML file at the front containing version information and metadata.
>
> Unfortunately VM exports containing raw disk blocks can be very large and
> their size makes them difficult to store and distribute over the network. I
> propose to turn on compression by default by filtering the exports through
> gzip and to auto-detect both compressed and uncompressed exports on import.
>
> I've written up my proposal on the wiki:
>
> http://wiki.xensource.com/xenwiki/Compressing_VM_exports
>
> One implication is that new (compressed) exports will fail to import on
> older servers. However (a) there's an easy workaround (gunzip); and (b) I
> think being able to import an old (uncompressed) export on a new server is
> more important than the other way around.
>
> Comments appreciated!
>
> Cheers,
> Dave
>
>
>
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> http://lists.xensource.com/xen-devel
>

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