Hello,
2013/1/4 tonyalbers <bacula-fo...@backupcentral.com>
> Hi Silver,
>
> The downside of client-side dedupe is actually a combination of several
> things.
>
> 1. The client does the dedupe calculations etc. this means that it takes
> CPU resources on the client which it might not have.
>
Yes it could be a problem in some cases. Our testings shows that
deduplication computing has less cpu requirements than compression or
encryption. Using a modern processors available today in the market this
should not be a problem.
> 2. Sometimes, client-side dedupe is chosen because of bandwidth
> limitations to the backup server (remote offices etc). In case of a large
> restore all files will have to be sent from the backup server to the client
> anyway, and this can be almost impossible because of the time it will take.
> That's the RTO side of it.
>
The same for server side only deduplication or no deduplication at all.
There are no difference. If you have a slow link that your recovery will be
slow.
> 3. Partial restores can only be made to the client that did the backup,
> not to another client if necessary(redirected recover).
>
Not true. In our implementation we can restore any file to any
deduplication enabled bacula client. No restrictions here.
> There are probably more, but these are just what I can think of straight
> away.
>
The only real problem could be a #1 above. If your client does not have a
sufficient computing power then deduplication could be slow.
The main advantage of client side global deduplication is low network
bandwidth requirement with the same deduplication ratio (or better
depending on architecture and hardware) as with server side deduplication
only which leads to short backup window.
best regards
--
Radosław Korzeniewski
rados...@korzeniewski.net
------------------------------------------------------------------------------
Master HTML5, CSS3, ASP.NET, MVC, AJAX, Knockout.js, Web API and
much more. Get web development skills now with LearnDevNow -
350+ hours of step-by-step video tutorials by Microsoft MVPs and experts.
SALE $99.99 this month only -- learn more at:
http://p.sf.net/sfu/learnmore_122812
_______________________________________________
Bacula-users mailing list
Bacula-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/bacula-users
