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xen-users
Re: [Xen-users] Backup domU
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
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