i have some difficulty in understanding multi-device handling in depth.
as
http://btrfs.wiki.kernel.org/index.php/Using_Btrfs_with_Multiple_Devices
tells,
btrfs can span over multiple devices at the same time. (great feature,
btw !)
ok then:
mkfs.btrfs -m single -d single /dev/sdb /dev/sdc - creates a btrfs
spanning
over /dev/sdb and sdc
mount /dev/sdb /btrfs - mounts it
btrfs-vol -b /btrfs - does a rebalancing of all data and metadata
btrfs-vol -r /dev/sdc - removes one of the volumes and redistributes any
extends in use on sdc to sdb (killer feature!!!)
but what if i want to remove /dev/sdb ? (as that one is in use for the
mount)
Devices in btrfs are equal, so you can do this. The only glitch is
/proc/mounts and mount(8) get confused.
so i can do btrfs-vol -r /dev/sdb while it`s being mounted, pull the disk ,
replace it with a bigger one, rescan-scsi-bus, mkfs.btrfs the new disk and
then re-add - all while mount telling me, that /dev/sdb is still in use !?
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