Messages in this thread |  | | | Date | Tue, 19 Jun 2007 11:24:30 -0700 (PDT) | | From | david@lang ... | | Subject | Re: [ANNOUNCE] Btrfs: a copy on write, snapshotting FS |
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On Tue, 19 Jun 2007, Chris Mason wrote:
>>> 3. De-de-duplicate blocks on disk, i.e. copy them on write >>> >>> I suppose that de-duplication itself would be done by some user space >>> process that would scan files, determine blocks with the same data and >>> then de-duplicate them by using syscall or IOCTL (2). >>> >>> That would be very usable feature, which in most cases would allow to >>> shrink occupied disk space on 50-90%. >> >> Have you references for this number? >> In my experience one gets a lot of benefit from >> the much simpler process of "de-duplication" of files. > > Yes, I would expect simple hard links to be a better solution for this, > but the feature request is not that out of line. I actually had plans > on implementing auto duplicate block reuse earlier in btrfs.
with COW de-duplication you can merge things that have vastly different permissions. hard-links can't be used if different people have write permission.
David Lang
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