RE: [Xen-users] Xen 4.0 feature request

[Simon Hobson <linux@xxxxxxxxxxxxxxxx>]

Nathan Eisenberg wrote:

> Why can't you save only one VM with LVM snapshots?  Sounds like you 
> have an odd implementation, rather that there being a problem with 
> LVM.  We export two LVs per domU - 1 'data' and 1 'swap'.  I can 
> easily snapshot the 'data' LV of any single domU without a 
> performance problem.
How do you deal with the fact that you are snapshotting a dirty state 
? Unless you are using LVM inside the DomU (in which case Xen is 
irrelevant), then when you make a snapshot, it will NOT include any 
dirty blocks in the guests cache.
Unless you collaborate with the guest, get it to stop updating the 
filesystem, and flush it's cache - then you are pretty well 
guaranteed dirty (and probably corrupt) data.
--
Simon Hobson

Visit http://www.magpiesnestpublishing.co.uk/ for books by acclaimed
author Gladys Hobson. Novels - poetry - short stories - ideal as
Christmas stocking fillers. Some available as e-books.

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