On Wednesday 24 February 2010, planetf1 wrote:> Hi,
Hi
> Let me know if this is the wrong place to ask...
>
> I''m using Fedora 12 x86_64, mostly with the newer 21.6.32
kernel, and
> have a single btrfs filesystem within a 120Gb partition.
>
> I''d like to extend the space btrfs can use. One option is
presumably
> add a new device to btrfs, but I was hoping to simple resize the
> existing partition to say 160Gb.
>
> With ext4 I might do this with gparted , although mostly I''d use
LVM,
> with seperate LVs for /opt /home / etc and that''s been the way
I''ve done
> it for many years.
>
> With btrfs I''m unsure as to the safe steps and decided to skip
on use
> of LVM giving the enhanced capabilities of btrfs itself.
>
> Is it ok to resize the partition with gparted?
IIRC gparted want to resize both partition and filesystem. So if gparted
doesn''t support btrfs, it will not be usable> How do I make btrfs use the new partition size?
I am never tried, but it should be sufficient to
a) resize the underling partition (with fdisk)
b) resize the filesystem (with btrfsctl -r <size>
<path-to-filesystem>).
If you want to grow the filesystem, the step are a) then b). Otherwise if you
want to shrink the filesystem the step are b) then a)
Pay attention to:
- btrfs support online filesystem
- if you resize a partition it may be required to reboot the system, otherwise
the kernel may not be able to read the new size of the partition
- if you pass ''max'' as size of the btrfsctl utility, the
filesystem grows up
to fill all available space.
I suggest you to test the resizing on a loop device before tring a real
filesystem.
> Or are there other btrfs specific tools that can manage partitions
Not in my knowledge > Would I be better off still using lvm in conjunction with btrfs?
In theory btrfs has the capability to add/remove device and resize a
filesystem. But it is a young filesystem, so the results may be not the one
expected.> Are there good pointers to useful user material on btrfs on these issues?
http://btrfs.wiki.kernel.org/index.php
http://btrfs.wiki.kernel.org/index.php/Using_Btrfs_with_Multiple_Devices
> Is creating new subvolumes to manage /home (say I want to limit that
> space, and create snapshots independently) appropriate, and if so
what''s
> the easiest way to do that -- I had trouble with getting the subvolume
> ops to work
If you don''t use snapshot creating a subvolume is not useful. If you
had
problem, post the command which you had used.
> Mostly rather than NEED btrfs per se, I''m using a clean laptop
> environment as a way to experiment with the new filesystem & understand
> how to manage it.
>
> Thanks
> Nigel.
> bugs@cherrybyte.me.uk
>
BR
Goffredo>
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