On 01/12/2011 11:48 AM, Leonidas Spyropoulos wrote:
On 12 January 2011 18:45, Mikael Andersson<mikael@xxxxxxxxxx> wrote:
E.g. btrfsctl -r -4000m /dev/sda5
Hey Mikael,
btrfsctl is deprecated, you should use btrfs
In the previous example:
btrfs filesystem resize -4000m /dev/sda5
The command isn't asking for the name of the device. It wants the path
to a mounted btrfs filesystem. So more like:
btrfs filesystem resize -4000m /mnt
Also, the manpage doesn't say this, but you can specify which device to
resize. If you run 'btrfs filesystem show', it will show a device id for
each device. Then you can specify the devid to resize like this
(assuming you want to resize device 2):
btrfs filesystem resize 2:-4000m /mnt
To actually use this space for a new partition, you'll have to delete
and re-create (without reformatting!) the btrfs partition with the
smaller size. I don't know if there's a way to do this part on a live
system without unmounting.
Check the help of btrfs
And also good to download latest btrfs-progs from git and compile them
yourself the version of btrfs-progs on LiveCD is old.
Latest version I use for example is: v0.19-35-g1b444cd
results in:
ioctl:: Inappropriate ioctl for device
I believe you'll also get this same error message if there's not enough
space to do the shrinking, so be aware of that.
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