RE: [Xen-users] Cloning domUs

["Artur Linhart - Linux communication" <AL.LINUX@xxxxxxxxxxx>]

If LVM are used, what are Your opinions about the way simply to create the
snapshot volume to existing DomU and modify the configuration files on the
new volume only?

I tried it and it works OK, as far as I tested it till now... The advantage
is, You can save a lot of disk space because the data are shared by both
logical volumes till not modified... Also the snapshot creation takes1
second, so it is much more faster than copy the whole partition... Sure, for
swap I created brand new volumes, there is no reason to share the data.

Has this way some performance problems?

        With best regards,

                Archie

-----Original Message-----
From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx
[mailto:xen-users-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Nico
Kadel-Garcia
Sent: Tuesday, August 07, 2007 1:08 AM
To: Steve Wray
Cc: Stephen Shaw; Geoff Kirk; xen-users@xxxxxxxxxxxxxxxxxxx
Subject: Re: [Xen-users] Cloning domUs

Steve Wray wrote:
> Stephen Shaw wrote:
>>>>>> Nico Kadel-Garcia <nkadel@xxxxxxxxx> 08/06/07 1:41 PM >>>           
>>> Geoff Kirk wrote:
>>>    
>>>> shacky wrote:
>>>>      
>>>>>> What storage method are you using for the domU?
>>>>>>               
>>>>> I'm using LVM for most domUs...
>>>>>
>>>>>
>>>>>         
>>>> Using LVM i create a new volume  mount the domU i want to copy and 
>>>> the new volume, format the new volume and cp -dpR the files over, 
>>>> then edit the network/hostname config. Don't forget swap space too.
>>>>
>>>> It maybe you can just snapshot the domU and edit the network but i 
>>>> don't know if thats wise.
>>>>
>>>> Geoff.
>>>>       
>>> I use 'rsync -avH' instead of 'cp -a', since it handles being re-run 
>>> better and handles exclusions better, too.
>>>     
>>
>> rsync is great.  Are you creating sparse files?  If so, can rsync 
>> handle that
>>
>> I've used cp --sparse=always when I copy domUs
>>   
>
> And don't forget the --numeric-ids on rsync.
Not relevant here: the Dom0's /etc/passwd and associated uid's is the 
one in charge of both the source and target uid's. Very useful for other 
circumstances, though!

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