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From Andrei Mikhailovsky <>
Subject Re: Slow snapshots with KVM
Date Thu, 31 Jan 2013 11:08:41 GMT

Many thanks for all your answers. Indeed, the term Snapshot is a bit confusing, perhaps it
should be called something else ))). The trouble with the term Snapshot here is that the users
will think it's a Snapshot and will start using it left, right and centre without realising
that it takes ages to do, especially if many people are doing that simultaneously and it consumes
far more disk space compared with the traditional Snapshotting ))) 

----- Original Message -----

From: "Paul Angus" <> 
Sent: Thursday, 31 January, 2013 7:23:00 AM 
Subject: RE: Slow snapshots with KVM 

These are all valid points, but in the end CloudStack 'snapshots' do not behave in the way
people from a virtualisation background are likely to expect them to; You can't just press
a button and roll back, you can only create a clone of that VM which will have a different
MAC and a new IP address and possibly a new hostname... 

I agree it may not be the best backup solution, but IMHO 'a backup' is closer fit for the
functionality than a snapshot. 

Maybe we should all start calling a it a 'Clone'? 


Paul Angus 
S: +44 20 3603 0540 | M: +447711418784 

-----Original Message----- 
From: Nux! [] 
Sent: 30 January 2013 23:25 
Subject: Re: Slow snapshots with KVM 

On 30.01.2013 22:48, David Nalley wrote: 
> As long as you realize that these are 'crash consistent' snapshots, 
> then yes. I personally dislike using the term 'backup' for snapshots - 
> it's certainly not a method I'd use to backup data that was important 
> to me. 
> --David 

Crash consistent can be great when you don't have anything else. :-) Plus another advantage
of a full snapshot is that there's no I/O cost in maintaing it vs the changes in "master",
like it is with the e.g. lvm snapshots. So there are advantages and disadvantages.. 

Sent from the Delta quadrant using Borg technology! 


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