I had a RAID-1 filesystem with 2*3TB disks and 330G of disk space free according to df -h. I replaced a 3TB disk with a 4TB disk and df reported no change in the free space (as expected).
I added a 1TB disk to the filesystem and there was still no change! I expected that adding a 1TB disk would give 3TB+1TB on one side and 4TB on the other so I would instantly get an extra 1TB of free space according to df -h. 1072 out of about 2734 chunks balanced (1073 considered), 61% left I ran btrfs balance for just over a day and a btrfs balance status reported the above. But it still only showed 860G free according to df -h. I've cancelled the balance because 860G of free space is enough for the moment and I don't want that server running slowly and making noise any more. I think that the allocation of disk space needs to be improved. If I added a 1TB disk to a pair of 3TB disks then it would be quite reasonably for some serious reallocation to be required to make use of the extra space. But when I added a 1TB disk to an array that had a 3TB and a 4TB then it should be able to make use of the space quite easily. -- My Main Blog http://etbe.coker.com.au/ My Documents Blog http://doc.coker.com.au/ -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
