[Sheepdog] Backup/Images

[Liu Yuan]

On 10/09/2011 02:21 PM, Yibin Shen wrote:
>
>
> On Sun, Oct 9, 2011 at 1:33 PM, Liu Yuan <namei.unix at gmail.com 
> <mailto:namei.unix at gmail.com>> wrote:
>
>     On 10/09/2011 01:07 PM, MORITA Kazutaka wrote:
>
>         At Sun, 9 Oct 2011 11:21:52 +0800,
>         Yibin Shen wrote:
>
>             Use mmap is much simpler than local backup image, and without
>             any influence to consistency. but it doesn't improve
>             availability
>             while whole sheepdog cluster is die(such as some odd network
>             partition issue).
>
>             anyway, if no one againsts, I will try to implement it in the
>             near future (after we solved most stability issues)
>
>         Can we implement it as an extension of the cache mechanism?
>          If the
>         local cache file has whole data in the Sheepdog VDI, we can
>         regard it
>         as a local backup image.
>
>         Thanks,
>
>         Kazutaka
>
>
>     Maybe we can read-ahead in the whole data if network is not busy
>     gradually? When the whole image is read in, we can mark it as
>     'complete'.  If some time the cluster crashes, the complete image
>     would help the VMs on the very node to survive the crash. The
>     dirty bits will be flushed into cluster store in recovery stage.
>
> read-ahead whole image into memory?
>

Into file in the local disk, that is supposed to be mmapped into qemu 
process memory.

Thanks,
Yuan
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