More than thinking that it is possible, I do it every single day. It works,
and it works well. :)
There's no reason not to have dedicated Logical Volumes for every domU. It
makes dealing with the data backend a lot easier, as the volume management
becomes incredibly logical and well labeled.
Best Regards
Nathan Eisenberg
Sr. Systems Administrator
Atlas Networks, LLC
support@xxxxxxxxxxxxxxxx
http://support.atlasnetworks.us/portal
-----Original Message-----
From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx
[mailto:xen-users-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Enrico Valsecchi
Sent: Tuesday, July 07, 2009 6:48 AM
To: Simon Hobson
Cc: xen-users@xxxxxxxxxxxxxxxxxxx
Subject: Re: [Xen-users] Xen 4.0 feature request
>> 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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