Re: [Xen-users] Backup domU

[Andrew McGlashan <andrew.mcglashan@xxxxxxxxxxxxxxxxxxxxx>]

Rainer Sokoll wrote:
> Am 09.07.2011 um 12:17 schrieb Andrew McGlashan:
>
> > The only issue with rsync with rsnapshot from what I can see, is for very large 
> > files that change frequently.  You might end up having loads of copies of these 
> > large files and that would be painful in terms of storage and transfer.  Take a 
> > 2TB Oracle datafile for instance; don't want to touch that right now with this 
> > method, but Oracle has other backup methods anyway .....
> Yes, rsnapshot does deduplication by using hard links. This is file based 
> deduplication; what we really want is deduplication on block level, like e.g. 
> ZFS does.
> For Linux, I came across lessfs (http://sourceforge.net/projects/lessfs/files/).
> Anyone here who can provide experiences with lessfs?
If the file name changes whilst none if it's content does ... or the 
file's location changes, then rsnapshot doesn't de-duplicate those 
files.  Even files that are very slightly modified mean a whole new copy 
of them is created (no hard link).  Of course the old copies that are no 
longer on the system being backed up will "age out" via the cycling of 
rsnapshot directories over time.
--
Kind Regards
AndrewM

Andrew McGlashan
Broadband Solutions now including VoIP


_______________________________________________
Xen-users mailing list
Xen-users@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-users