On Mon, Dec 06, 2010 at 01:56:31AM -0800, Brian Rogers wrote: > On 12/05/2010 10:26 AM, Helmut Hullen wrote: > >>So, by far the simplest solution would be to re-create your file > >>system with "single" mode, > >Can I add or delete hard disks/partitions to the two devices/partitions > >in your example? > > You can add, but you'll want to avoid deleting, balancing, and > shrinking. From my testing, any of these operations will convert the > chunks they relocate to raid0. Then, once you have any raid0 data, > btrfs will want to allocate all new chunks as raid0 and you'll have > the unusable space problem again.
That's a known bug. Josef even posted a patch for it (but it's apparently not doing the right thing yet). > >I've studied the man page and the Wiki but didn't find any help. > > > >And in my special case I have to add at least yearly new disks and from > >time to time remove the smallest disks from this bundle. > > With the current state of btrfs, you could do this as long as you > never reduce the total number of disks. When you want to replace an > old disk with a new one, just go around btrfs: take the filesystem > offline and copy the old disk's partition into a full-sized > partition on the new disk. Then remove the old disk and bring the > filesystem online again. > > It will remember the old size at first, but that can be fixed with > > btrfs filesystem resize <devid>:max <path> This doesn't work on multi-volume filesystems (yet). Hugo. -- === Hugo Mills: h...@... carfax.org.uk | darksatanic.net | lug.org.uk === PGP key: 515C238D from wwwkeys.eu.pgp.net or http://www.carfax.org.uk --- We believe in free will because we have no choice. ---
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