BTRFS send/receive limitations
I read recently that you can't send/receive concurrent streams on the same filesystem, which begs the question of what is meant by a "filesystem". Is that to say that you can't send/receive snapshots on different subvolumes to the same "root filesystem"? Or that you can't send/receive multiple snapshots on the same subvolume? Can you send/receive a snapshot or subvolume to the same root filesystem?
-Ben
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I read recently that you can't send/receive concurrent streams on the same filesystem, which begs the question of what is meant by a "filesystem". Is that to say that you can't send/receive snapshots on different subvolumes to the same "root filesystem"? Or that you can't send/receive multiple snapshots on the same subvolume? Can you send/receive a snapshot or subvolume to the same root filesystem?
The restriction was on the same *filesystem* as a whole: there was
a global lock on the whole FS, which could cause deadlocks with send and receive both accessing the same FS (any subvolumes). I don't recall hearing about problems with two sends from different subvols on the same FS, but that might just be because I wasn't paying attention. :)
I think those restrictions are gone now, in some patch in the
pipeline. Possibly for 3.15 -- I'm not sure if the patches made it into 3.14.
Hugo.
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