Single Instance Service
speedtoys.racing at gmail.com
Thu Apr 26 16:53:34 UTC 2007
It can if your storage appliance supports ASIS. Some even operate at the
block level, not just the file level.
On 4/26/07, GARRISON, TRAVIS J. <garrisot at otc.edu> wrote:
> > -----Original Message-----
> > From: owner-freebsd-questions at freebsd.org [mailto:owner-freebsd-
> > questions at freebsd.org] On Behalf Of Olivier Nicole
> > Sent: Thursday, April 26, 2007 1:36 AM
> > To: m.seaman at infracaninophile.co.uk
> > Cc: GARRISON, TRAVIS J.; freebsd-questions at freebsd.org
> > Subject: Re: Single Instance Service
> > > Sure it is. You will need to write a small shell script to scan
> > > your disk volume and calculate the checksum of each file. When
> > > ever it finds a duplicated checksum, then it copies the file into
> > > the central store and replaces the on-disk copies with symbolic
> > > links. That's fairly trivial to write.
> > Beside, what should be the behaviour when one wishes to modify his own
> > copy of a document? How does Single Instance acts in that case?
> > If you establish a link, there is only one version of the file, once
> > and forever (unless you go and unlink it manually), so when one
> > modifies the file, modification applies for everyone.
> > Olivier
> [GARRISON, TRAVIS J.]
> I know with Windows Storage Server, if a user modifies the file, it will
> then create the user their own copy of the file. This happens
> automatically. Exchange Server is another example of this type of
> storage. When someone sends an attachment to several people, the server
> saved one copy of the file. I am currently managing 7TB worth of data
> with roughly 1 to 2TB of duplicate files. This gets fairly expensive
> with a fiber channel san backend. I know it can be done in the windows
> world automatically, just wondered if it could be done automatically in
> the Unix world also.
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