[Discuss] btrfs

[Dan Ritter]

On Tue, Feb 26, 2013 at 11:00:58AM -0500, Derek Atkins wrote:
> Dan Ritter <dsr at randomstring.org> writes:
> 
> > +++
> >  How much space do I get with unequal devices in RAID-1 mode?
> 
> I presume this is also true of RAID-10 mode?

I haven't done this myself, and I'm not sure.

> If you add new disks to an existing array (to grow the array) will it
> rebalance the stripes across the new disks?  If so, will it do it
> automatically or does it require a user process to rebalance?  (Note
> that rebalancing slowly is fine for my usage, provided it's a live
> rebalance).   I've a similar question about replacing a disk with a
> larger one -- will it properly rebalance?

Yes it can be rebalanced; no, it's not automatic. The command is
btrfs balance, and it can be paused, resumed and cancelled. The
same holds true for replacing disks.

-dsr-