I'm trying to help someone resurrect a RAID1 mirrored LVM logical volume on an old server running Fedora 20 (lvm2-2.0.2.106, linux 3.19.8-100). One of the disks in the mirror is dead. The disk belonged to a VG named systemvg. vgchange says:
vgchange -a y --partial systemvg
PARTIAL MODE. Incomplete logical volumes will be processed.
PV qtva6m-iBhc-q3Zt-At1U-FiWH-iZd8-tjpR0u not recognised. Is the device missing?
device-mapper: reload ioctl on failed: Input/output error
1 logical volume(s) in volume group "systemvg" now active
(The "ioctl on failed" is puzzling, but whatever.)
Now we try to repair the LV named "home" in that VG:
lvconvert --repair systemvg/home
PV qtva6m-iBhc-q3Zt-At1U-FiWH-iZd8-tjpR0u not recognised. Is the device missing?
Attempt to replace failed RAID images (requires full device resync)? [y/n]: y
device-mapper: create ioctl on systemvg-home_rmeta_2 failed: Device or resource busy
Failed to suspend systemvg/home before committing changes
Failed to replace faulty devices in systemvg/home.
Device '/dev/sdc' has been left open (1 remaining references).
Device '/dev/sda1' has been left open (1 remaining references).
Internal error: 2 device(s) were left open and have been closed.
The situation is now complicated by the fact that we (foolishly?) added a new PV (new blank disk) to systemvg using vgextend, in the hope that this would help. It didn't, and now we can't remove that disk from systemvg.
lsblk currently shows:
sda 8:0 0 7.3T 0 disk
└─sda1 8:1 0 7.3T 0 part
├─systemvg-home_rmeta_2 253:9 0 4M 0 lvm
└─systemvg-home_rimage_2 253:10 0 5.5T 0 lvm
sdc 8:32 0 5.5T 0 disk
├─systemvg-home_rmeta_0 253:2 0 4M 0 lvm
└─systemvg-home_rimage_0 253:3 0 5.5T 0 lvm
systemvg-home_rmeta_1-missing_0_0 253:4 0 4M 0 lvm
└─systemvg-home_rmeta_1 253:5 0 4M 0 lvm
systemvg-home_rimage_1-missing_0_0 253:6 0 5.5T 0 lvm
└─systemvg-home_rimage_1 253:7 0 5.5T 0 lvm
sdc is the remaining original half of the mirror. sda is the new empty disk we added to systemvg.
/dev/mapper contains:
systemvg-home_rimage_0
systemvg-home_rimage_1
systemvg-home_rimage_1-missing_0_0
systemvg-home_rimage_2
systemvg-home_rmeta_0
systemvg-home_rmeta_1
systemvg-home_rmeta_1-missing_0_0
systemvg-home_rmeta_2
but no "/dev/mapper/systemvg-home".
How can we recover the data from the remaining half of the mirror?
