On Mon, Mar 01, 2021 at 12:19:12PM +0100, Christian Völker wrote: > I am using BTRS on a Debian10 system. I am trying to extend my existing > filesystem with another device but adding it fails for no reason. > > This is my setup of existing btrfs: > > 2x DRBD Devices (Network RAID1) > top of each a luks encrypted device (crypt_drbd1 and crypt_drbd3): > > vdb 254:16 0 1,1T 0 disk > └─drbd1 147:1 0 1,1T 0 disk > └─crypt_drbd1 253:3 0 1,1T 0 crypt > vdc 254:32 0 900G 0 disk > └─drbd2 147:2 0 900G 0 disk > └─crypt2 253:4 0 900G 0 crypt > vdd 254:48 0 800G 0 disk > └─drbd3 147:3 0 800G 0 disk > └─crypt_drbd3 253:5 0 800G 0 crypt /var/lib/backuppc > > > > I have now a third drbd device (drbd2) which I encrypted, too (crypt2). And > tried to add to existing fi. > Here further system information: > > Linux backuppc41 5.10.0-3-amd64 #1 SMP Debian 5.10.13-1 (2021-02-06) x86_64 > GNU/Linux > btrfs-progs v5.10.1 > > root@backuppc41:~# btrfs fi sh > Label: 'backcuppc' uuid: 73b98c7b-832a-437a-a15b-6cb00734e5db > Total devices 2 FS bytes used 1.83TiB > devid 3 size 799.96GiB used 789.96GiB path dm-5 > devid 4 size 1.07TiB used 1.06TiB path dm-3 > > > I can create an additional btrfs filesystem with mkfs.btrfs on the new > device without any issues: > > root@backuppc41:~# btrfs fi sh > Label: 'backcuppc' uuid: 73b98c7b-832a-437a-a15b-6cb00734e5db > Total devices 2 FS bytes used 1.83TiB > devid 3 size 799.96GiB used 789.96GiB path dm-5 > devid 4 size 1.07TiB used 1.06TiB path dm-3 > > Label: none uuid: b111a08e-2969-457a-b9f1-551ff65451d1 > Total devices 1 FS bytes used 128.00KiB > devid 1 size 899.96GiB used 2.02GiB path /dev/mapper/crypt2 > > But I can not add this device to the existing btrfs fi: > root@backuppc41:~# wipefs /dev/mapper/crypt2 -a > /dev/mapper/crypt2: 8 bytes were erased at offset 0x00010040 (btrfs): 5f 42 > 48 52 66 53 5f 4d > > root@backuppc41:~# btrfs device add /dev/mapper/crypt2 /var/lib/backuppc/ > ERROR: error adding device 'dm-4': No such file or directory > > This is what I see in dmesg: > [43827.535383] BTRFS info (device dm-5): disk added /dev/drbd2 > [43868.910994] BTRFS info (device dm-5): device deleted: /dev/drbd2 > [48125.323995] BTRFS: device fsid 2b4b631c-b500-4f8d-909c-e88b012eba1e devid > 1 transid 5 /dev/mapper/crypt2 scanned by mkfs.btrfs (4937) > [57799.499249] BTRFS: device fsid b111a08e-2969-457a-b9f1-551ff65451d1 devid > 1 transid 5 /dev/mapper/crypt2 scanned by mkfs.btrfs (5178)
We had someone on IRC a couple of days ago with exactly the same kind of problem. I don't think I have a record of the solution in my IRC logs, though, and I don't think we got to the bottom of it. From memory, a reboot helped. Hugo. > And these are the mapping in dm: > > root@backuppc41:~# ll /dev/mapper/ > insgesamt 0 > lrwxrwxrwx 1 root root 7 28. Feb 21:08 backuppc41--vg-root -> ../dm-1 > lrwxrwxrwx 1 root root 7 28. Feb 21:08 backuppc41--vg-swap_1 -> > ../dm-2 > crw------- 1 root root 10, 236 28. Feb 21:08 control > lrwxrwxrwx 1 root root 7 1. Mär 12:12 crypt2 -> ../dm-4 > lrwxrwxrwx 1 root root 7 28. Feb 20:21 crypt_drbd1 -> ../dm-3 > lrwxrwxrwx 1 root root 7 28. Feb 20:21 crypt_drbd3 -> ../dm-5 > lrwxrwxrwx 1 root root 7 28. Feb 21:08 vda5_crypt -> ../dm-0 > > > Anyone having an idea why I can not add the device to the existing > filesystem? The error message is not really helpful... > > Thanks a lot! > > /KNEBB -- Hugo Mills | Releasing out of hours. A Haiku: hugo@... carfax.org.uk | Simply merge PR http://carfax.org.uk/ | It is wrong. Buildkite, cancel! PGP: E2AB1DE4 | gitops now corrupt
