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RE: [Xen-users] Xen 4.0 feature request

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

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