Hi I fooled around with RAID and didn't quite get how to use -o degraded the way it's meant. I asked on http://askubuntu.com/questions/49893/how-does-btrfs-raid-work-in-degraded-mode/ . It goes like this: -Create the raid array "sudo mkfs.btrfs -m raid1 -d raid1 /dev/loop1 /dev/loop2" -mount them "sudo mount /dev/loop1 /mnt" and mark them "touch goodcondition" -You unmount and simulate disk failure (remove disk or delete loopback device loop2 in my case) -You mount degraded "-o degraded" and mark again "touch degraded" -You add the bad disk again "sudo btrfs dev add /dev/loop2" -You rebalance "sudo btrfs fi ba /mnt" And Raid 1 should work again. But that's not the case. "sudo btrfs fi show":
Total devices 3 FS bytes used 28.00KB devid 3 size 4.00GB used 264.00MB path /dev/loop1 devid 2 size 4.00GB used 272.00MB path /dev/loop2 *** Some devices missing It looks like I added another device instead of replacing. I got the info so far from https://btrfs.wiki.kernel.org/index.php/Using_Btrfs_with_Multiple_Devices#Creating_a_Multi-device_FS last paragraph. So howdo I tell btrfs to use the newly created loop2 as a replacement for loop2 NB This is the first time I'm using a mailing list, so if I'm making some obvious mistakes please point them out. Tobias Kronawitter -- 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
