Hi list -
Long time ZFS guy here trying to move everything over from ZFS to btrfs,
which entails a lot of re-scripting and re-learning.
Question of the day: how can I determine the size of a btrfs send
operation before hand? I'd like to be able to provide a progress bar
(I'm accustomed to using pv to do this), but I would need to know a
rough approximation at least of how much data I'm going to transfer in
order to be able to do that.
Under ZFS, you can do this:
root@box:~# zfs send -nvi
data/images@autosnap_2013-11-27_14:00:01_hourly
data/images@autosnap_2013-11-27_15:00:01_hourly
send from @autosnap_2013-11-27_14:00:01_hourly to
data/images@autosnap_2013-11-27_15:00:01_hourly estimated size is 42.7M
total estimated size is 42.7M
Which then lets me do this:
root@box:~# zfs send -i data/images@autosnap_2013-11-27_14:00:01_hourly
data/images@autosnap_2013-11-27_15:00:01_hourly | pv -s 42.7M | ssh
otherbox zfs receive backup/images
And get a nice progress bar.
I can't find a manpage for the btrfs command that lists ANY information
about btrfs send, and I haven't found anything online about doing a size
check on send operations without actually sending the data. Anybody got
any help for this? This is officially a Big Deal for those of us who
customarily do asynchronous replication, so it would be really, really
awesome if this could get addressed. =)
Thank you!
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