I created a single-device btrfs filesystem. According to the btrfs wiki article on using multiple devices, I should be able to convert that to RAID1 using:
btrfs balance start -dconvert=raid1 -mconvert=raid1 /path
I started that on Linux 3.16, and it failed (kernel panic). Upgraded to Linux 4.0, after mounting the filesystem it continued and finished. But it only did the data, not the metadata or system (according to
btrfs fi df). I grabbed the latest btrfs-progs from git (just to make sure it wasn't due to an old version), and did:
Watt:/home/anthony/src/btrfs-progs# ./btrfs balance start -v -mconvert=raid1 /path Dumping filters: flags 0x6, state 0x0, force is off METADATA (flags 0x100): converting, target=16, soft is off SYSTEM (flags 0x100): converting, target=16, soft is off Done, had to relocate 6 out of 1411 chunks
But that didn't actually mirror it, apparently. Right now, I have:
Watt:/home/anthony/src/btrfs-progs# ./btrfs fi usage /path Overall: Device size: 7.28TiB Device allocated: 2.75TiB Device unallocated: 4.53TiB Device missing: 0.00B Used: 2.74TiB Free (estimated): 2.26TiB (min: 2.26TiB) Data ratio: 2.00 Metadata ratio: 2.00 Global reserve: 512.00MiB (used: 0.00B) Data,RAID1: Size:1.37TiB, Used:1.37TiB /dev/mapper/luks-562e4e2f-2894-415a-aaf1-7c94a11c33b9 1.37TiB /dev/mapper/luks-ec97c1ad-21d8-41bb-9072-e5a74f68e416 1.37TiB Metadata,DUP: Size:2.50GiB, Used:1.58GiB /dev/mapper/luks-562e4e2f-2894-415a-aaf1-7c94a11c33b9 5.00GiB System,DUP: Size:32.00MiB, Used:224.00KiB /dev/mapper/luks-562e4e2f-2894-415a-aaf1-7c94a11c33b9 64.00MiB Unallocated: /dev/mapper/luks-562e4e2f-2894-415a-aaf1-7c94a11c33b9 3.17TiB /dev/mapper/luks-ec97c1ad-21d8-41bb-9072-e5a74f68e416 1.36TiB
I tried the full balance again (with both
-mconvert=raid1) and that didn't do it, either.
NOTE: The larger disk (56…b9) is the one I added.
How can I get the metadata and system mirrored?