On Fri, Jul 10, 2015 at 03:03:27PM -0400, Vincent Olivier wrote: > actually I have another question : is it posssible for a RAID0 fs to “receive” from a “sending” RAID10 ? Yes, definitely. I do my backups from RAID-1 to single. The send stream format is based on files, not on the underlying raw storage. Hugo. >or do they need to be of the same replication scheme too ? > > > > > On Jun 27, 2015, at 10:34 AM, Vincent Olivier <vincent@xxxxxxx> wrote: > > > > ok i’ll go home and rethink my life then ;) > > > >> On Jun 27, 2015, at 10:21 AM, Hugo Mills <hugo@xxxxxxxxxxxxx> wrote: > >> > >> On Sat, Jun 27, 2015 at 10:04:28AM -0400, Vincent Olivier wrote: > >>> Hi, > >>> > >>> There are 4 things I’m not sure about re:send/receive. > >>> > >>> 1) Is it possible to first copy things on a file system using rsync and then use send-receive ? And to subsequently mix rsync and send-receive ? Provided that snapshots are made accordingly. > >> > >> Probably. It depends on exctly how you want to use them. > >> > >>> 2) Is possible to “send" a snapshot diff to disk and then “receive" it from the said disk into a remote filesystem ? I have two very large and physically distant btrfs filesystems. It would be more economical to juste dump snapshot diffs to disk for transport instead of the network. > >> > >> Yes, that's perfectly possible. > >> > >>> 3) How are “conflicts” handled by send-receive if at all ? > >> > >> There are no conflicts possible, due to the requirement of all the > >> subvolumes involved in the send/receive process being read-only. > >> (Actually, that's not quite true -- you can make a subvolume > >> read/write, and then read-only again. In that case, the receive will > >> probably fail, leaving the received subvolume in a partially-created > >> state). > >> > >>> 4) If a file is created, modified and then deleted in-between two > >>> snapshots is it ignored by send/receive or does send/receive > >>> "re-enacts” the journal exactly ? > >> > >> It'll be ignored. The FS doesn't keep track of how it reached a > >> particular state -- only what that state is. > >> > >> Hugo. > >> -- Hugo Mills | UNIX: Japanese brand of food containers hugo@... carfax.org.uk | http://carfax.org.uk/ | PGP: E2AB1DE4 |
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