Glenn, does AST pax support data deduplication, i.e. has a ustar extension which allows that data blocks which share the same content are only stored once?
Irek ---------- Forwarded message ---------- From: Arne Jansen <[email protected]> Date: Fri, Oct 19, 2012 at 11:23 AM Subject: Re: [zfs-discuss] [zfs] portable zfs send streams (preview webrev) To: Irek Szczesniak <[email protected]> Cc: [email protected], [email protected], Matthew Ahrens <[email protected]>, Alexander Block <[email protected]> On 19.10.2012 11:16, Irek Szczesniak wrote: > On Wed, Oct 17, 2012 at 2:29 PM, Arne Jansen <[email protected]> wrote: >> We have finished a beta version of the feature. A webrev for it >> can be found here: >> >> http://cr.illumos.org/~webrev/sensille/fits-send/ >> >> It adds a command 'zfs fits-send'. The resulting streams can >> currently only be received on btrfs, but more receivers will >> follow. >> It would be great if anyone interested could give it some testing >> and/or review. If there are no objections, I'll send a formal >> webrev soon. > > Why are you trying to reinvent the wheel? AFAIK some tar versions and > AT&T AST pax support deltas based on a standard (I'll have to dig out > the exact specification, but from looking at it you did double work). > I haven't done the research myself, but the result was that pax would have needed significant extension, but I don't have the details. If you dig out a format already in use that supports everything we need (like sharing data between files, needed for btrfs reflinks), it should be easy to change the format. Stuffing the data into a specific format is not an essential part of the work and can be changed with a limited amount of work. -Arne > Irek _______________________________________________ ast-users mailing list [email protected] https://mailman.research.att.com/mailman/listinfo/ast-users
