[Server-devel] RW Compressed FUSE FSs? (Re: XS - XO archiving and backup)
bogstad at pobox.com
Mon Nov 10 18:52:43 EST 2008
On Mon, Nov 10, 2008 at 2:34 PM, <pgf at laptop.org> wrote:
> martin wrote:
> > On Mon, Nov 10, 2008 at 11:17 AM, Tomeu Vizoso <tomeu at tomeuvizoso.net> wrote:
> > > I would get a real journal and check for real which is the
> > > compressibility of the data that is actually there.
> > On a test machine with a good cross-section of activity documents, I
> > gzipped all the files in the datastore directory. Only 6% storage
> > savings according to the gzip stats - higher if I only look at the
> > metadata files (avg 12%). Several files had negative compression
> > ratios.
> > So your suspicions seem correct - compression is a marginal win at
> > best for ds-backup.
> i assume we're already doing duplicate checks in order to avoid
> storing the same present-on-every-client executable N times, right?
Ds-backup only backs up files in the XO users journal so except for
downloaded *.xo bundles there won't be any?? 'executables'. i.e. You
won't get the large reduction that you see in backups of Windows/Linux
clients OS images where 4 or 5 gigs of storage is replicated across
all of the machines you are backing up.
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