Re: [Xen-users] Xen 4.0 feature request

[Enrico Valsecchi <admin@xxxxxxxxxx>]

> > 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.
Sorry,
but I think that are more cleaned that if you want manage a XEN 
consistent snapshot, XEN must have this function!
O.K., you CAN use other external tool to have a consistent snapshots.
Very unique mode are use LVM, BUT, if you want have use a LVM snapshot, 
you MUST have dedicated LMV volume for ANY virtual machine....
....good?

You think really that, in a scenario with 30/50/100/150 active virtual 
machine, is possible use a dedicated LVM volume for any machine??????????
Enrico

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