EDIT**
I have a volume group consisting of 5 RAID1 devices grouped together into a lvm and formatted with xfs. The 5th RAID device lost its RAID config (cat /proc/mdstat does not show anything). The two drives are still present (sdj and sdk), but they have no partitions. The LVM appeared to be happily using sdj up until recently. (doing a pvscan showed the first 4 RAID1 devices + /dev/sdj) I removed the LVM from the fstab, rebooted, then ran xfs_check on the LV. It ran for about half an hour, then stopped with an error.
I tried rebooting again, and this time when it came up, the logical volume was no longer there. It is now looking for /dev/md5, which is gone (though it had been using /dev/sdj earlier). /dev/sdj was having read errors, but after replacing the SATA cable, those went away, so the drive appears to be fine for now.
Can I modify the /etc/lvm/backup/dedvol, change the device to /dev/sdj and do a vgcfgrestore? I could try doing a pvcreate --uuid KZron2-pPTr-ZYeQ-PKXX-4Woq-6aNc-AG4rRJ /dev/sdj to make it recognize it, but I'm afraid that would erase the data on the drive
UPDATE: just changing the pv to point to /dev/sdj did not work
vgcfgrestore --file /etc/lvm/backup/dedvol dedvol
Couldn't find device with uuid 'KZron2-pPTr-ZYeQ-PKXX-4Woq-6aNc-AG4rRJ'.
Cannot restore Volume Group dedvol with 1 PVs marked as missing.
Restore failed.
pvscan
/dev/sdj: read failed after 0 of 4096 at 0: Input/output error
Couldn't find device with uuid 'KZron2-pPTr-ZYeQ-PKXX-4Woq-6aNc-AG4rRJ'.
Couldn't find device with uuid 'KZron2-pPTr-ZYeQ-PKXX-4Woq-6aNc-AG4rRJ'.
Couldn't find device with uuid 'KZron2-pPTr-ZYeQ-PKXX-4Woq-6aNc-AG4rRJ'.
Couldn't find device with uuid 'KZron2-pPTr-ZYeQ-PKXX-4Woq-6aNc-AG4rRJ'.
PV /dev/sdd2 VG VolGroup00 lvm2 [74.41 GB / 0 free]
PV /dev/md2 VG dedvol lvm2 [931.51 GB / 0 free]
PV /dev/md3 VG dedvol lvm2 [931.51 GB / 0 free]
PV /dev/md0 VG dedvol lvm2 [931.51 GB / 0 free]
PV /dev/md4 VG dedvol lvm2 [931.51 GB / 0 free]
PV unknown device VG dedvol lvm2 [1.82 TB / 63.05 GB free]
Total: 6 [5.53 TB] / in use: 6 [5.53 TB] / in no VG: 0 [0 ]
vgscan
Reading all physical volumes. This may take a while...
/dev/sdj: read failed after 0 of 4096 at 0: Input/output error
/dev/sdj: read failed after 0 of 4096 at 2000398843904: Input/output error
Found volume group "VolGroup00" using metadata type lvm2
Found volume group "dedvol" using metadata type lvm2
vgdisplay dedvol
--- Volume group ---
VG Name dedvol
System ID
Format lvm2
Metadata Areas 5
Metadata Sequence No 10
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 1
Open LV 0
Max PV 0
Cur PV 5
Act PV 5
VG Size 5.46 TB
PE Size 4.00 MB
Total PE 1430796
Alloc PE / Size 1414656 / 5.40 TB
Free PE / Size 16140 / 63.05 GB
VG UUID o1U6Ll-5WH8-Pv7Z-Rtc4-1qYp-oiWA-cPD246
dedvol {
id = "o1U6Ll-5WH8-Pv7Z-Rtc4-1qYp-oiWA-cPD246"
seqno = 10
status = ["RESIZEABLE", "READ", "WRITE"]
flags = []
extent_size = 8192 # 4 Megabytes
max_lv = 0
max_pv = 0
physical_volumes {
pv0 {
id = "Msiee7-Zovu-VSJ3-Y2hR-uBVd-6PaT-Ho9v95"
device = "/dev/md2" # Hint only
status = ["ALLOCATABLE"]
flags = []
dev_size = 1953519872 # 931.511 Gigabytes
pe_start = 384
pe_count = 238466 # 931.508 Gigabytes
}
pv1 {
id = "ZittCN-0x6L-cOsW-v1v4-atVN-fEWF-e3lqUe"
device = "/dev/md3" # Hint only
status = ["ALLOCATABLE"]
flags = []
dev_size = 1953519872 # 931.511 Gigabytes
pe_start = 384
pe_count = 238466 # 931.508 Gigabytes
}
pv2 {
id = "NRNo0w-kgGr-dUxA-mWnl-bU5v-Wld0-XeKVLD"
device = "/dev/md0" # Hint only
status = ["ALLOCATABLE"]
flags = []
dev_size = 1953519872 # 931.511 Gigabytes
pe_start = 384
pe_count = 238466 # 931.508 Gigabytes
}
pv3 {
id = "2EfLFr-JcRe-MusW-mfAs-WCct-u4iV-W0pmG3"
device = "/dev/md4" # Hint only
status = ["ALLOCATABLE"]
flags = []
dev_size = 1953519872 # 931.511 Gigabytes
pe_start = 384
pe_count = 238466 # 931.508 Gigabytes
}
pv4 {
id = "KZron2-pPTr-ZYeQ-PKXX-4Woq-6aNc-AG4rRJ"
device = "/dev/md5" # Hint only
status = ["ALLOCATABLE"]
flags = []
dev_size = 3907028992 # 1.81935 Terabytes
pe_start = 384
pe_count = 476932 # 1.81935 Terabytes
}
}
