Date: Thu, 26 Apr 2007 09:53:32 -0700 From: "Jeff Mohler" <speedtoys.racing@gmail.com> To: "GARRISON, TRAVIS J." <garrisot@otc.edu> Cc: freebsd-questions@freebsd.org Subject: Re: Single Instance Service Message-ID: <a969fbd10704260953h4e2da25bkebe2826aac2c090@mail.gmail.com> In-Reply-To: <06D1B6D4926222458F803D0D3EDCCB7E01D0A790@EXM1.otc.edu> References: <200704260635.l3Q6ZZhL090019@banyan.cs.ait.ac.th> <06D1B6D4926222458F803D0D3EDCCB7E01D0A790@EXM1.otc.edu>
next in thread | previous in thread | raw e-mail | index | archive | help
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@otc.edu> wrote: > > > -----Original Message----- > > From: owner-freebsd-questions@freebsd.org [mailto:owner-freebsd- > > questions@freebsd.org] On Behalf Of Olivier Nicole > > Sent: Thursday, April 26, 2007 1:36 AM > > To: m.seaman@infracaninophile.co.uk > > Cc: GARRISON, TRAVIS J.; freebsd-questions@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. > _______________________________________________ > freebsd-questions@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-questions > To unsubscribe, send any mail to " > freebsd-questions-unsubscribe@freebsd.org" >
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?a969fbd10704260953h4e2da25bkebe2826aac2c090>