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RE: [Xen-users] Xen 4.0 feature request

To: "xen-users@xxxxxxxxxxxxxxxxxxx" <xen-users@xxxxxxxxxxxxxxxxxxx>
Subject: RE: [Xen-users] Xen 4.0 feature request
From: Nathan Eisenberg <nathan@xxxxxxxxxxxxxxxx>
Date: Tue, 7 Jul 2009 10:31:25 -0700
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Thread-topic: [Xen-users] Xen 4.0 feature request
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

-----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.
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....

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??????????


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