Re: [Xen-users] Question, about controlling duplicate data on xen...

["Nick Couchman" <Nick.Couchman@xxxxxxxxx>]

Controlling and managing duplicate data isn't really a Xen function.  There are 
a few ways to do it, though:

- File system or NAS with deduplication support.  If you store your VMs on ZFS, 
DataDomain, or something similar, you can get deduplication at the storage 
level.  Unfortunately DataDomain (EMC) is expensive, and ZFS deduplication 
still has some issues that need to be worked out before it's really ready for a 
production environment.

- Qcow/Qcow2 disks.  Unfortunately this isn't a way of removing duplicate data, 
it's a way of minimizing the growth of duplicate data, and there really isn't 
any way to go back and remove duplicate data after it has built up.  qcow disks 
allow you to use a single base disk image for your VMs and then have a 
copy-on-write disk for each of the VMs.  Thus, only data that changes from the 
original disk is actually written to the new file.  Unfortunately, with the 
rate at which updates for operating systems are produced, qcow disks can grow 
rather rapidly, and, in my experience, actually consume more space than 
traditional disks.

-Nick

>>> On 2010/04/30 at 09:55, Myungkyoon Kim <robinkim82@xxxxxxxxx> wrote: 
> hello, i`m interested in building data server by using xen.
> 
> and i wonder that if it's possible to check or remove duplicate datas in
> VMs for
> 
> the efficient storage management.
> 
> does anyone know about this kind of function or method in xen?
> 
> please help me to look for about it.
> 
> g'day
> 
> robin
> 




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