Performing a system upgrade, I lost important data from a logical volume. The only thing I have to retrieve that data is a snapshot inactive, because the COW out of space in the update. When I try to mount the snapshot, I get I / O errors. And if I try to mount the partition COW, this show me unknown file system error.
¿I can extract data from a snapshot invalid or Cow?
Thanks and regards.
# dmsetup status
eBox--Veneyarna-swap_1: 0 20209664 linear
eBox--Veneyarna-root-real: 0 550223872 linear
eBox--Veneyarna-rootsnap: 0 550223872 snapshot Invalid
eBox--Veneyarna-backups: 0 104857600 linear
eBox--Veneyarna-rootsnap-cow: 0 419430400 linear
eBox--Veneyarna-root: 0 550223872 snapshot-origin
# dmsetup table
eBox--Veneyarna-swap_1: 0 20209664 linear 8:5 550224256
eBox--Veneyarna-root-real: 0 550223872 linear 8:5 384
eBox--Veneyarna-rootsnap: 0 550223872 snapshot 252:0 252:2 P 16
eBox--Veneyarna-backups: 0 104857600 linear 8:17 384
eBox--Veneyarna-rootsnap-cow: 0 419430400 linear 8:17 104857984
eBox--Veneyarna-root: 0 550223872 snapshot-origin 252:0
# vgdisplay
/dev/dm-3: read failed after 0 of 4096 at 0: Input/output error
--- Volume group ---
VG Name eBox-Veneyarna
System ID
Format lvm2
Metadata Areas 2
Metadata Sequence No 23
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 4
Open LV 1
Max PV 0
Cur PV 2
Act PV 2
VG Size 737.25 GiB
PE Size 4.00 MiB
Total PE 188735
Alloc PE / Size 133633 / 522.00 GiB
Free PE / Size 55102 / 215.24 GiB
VG UUID IB3AdY-85sg-p5El-L1Er-qpB3-0BWI-LvYmYj
# lvdisplay
/dev/dm-3: read failed after 0 of 4096 at 0: Input/output error
--- Logical volume ---
LV Name /dev/eBox-Veneyarna/root
VG Name eBox-Veneyarna
LV UUID FhcR2z-aouw-X6wg-BKsz-wNdX-QwvS-KWZoiV
LV Write Access read/write
LV snapshot status source of
/dev/eBox-Veneyarna/rootsnap [INACTIVE]
LV Status available
# open 0
LV Size 262.37 GiB
Current LE 67166
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 252:1
--- Logical volume ---
LV Name /dev/eBox-Veneyarna/swap_1
VG Name eBox-Veneyarna
LV UUID Czx0Yi-1NCA-Ejwv-i0S2-I1yW-amD8-eV6KY8
LV Write Access read/write
LV Status available
# open 0
LV Size 9.64 GiB
Current LE 2467
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 252:4
--- Logical volume ---
LV Name /dev/eBox-Veneyarna/backups
VG Name eBox-Veneyarna
LV UUID 5uWOv8-mwp2-utqI-QtAC-rbH3-GejG-zcWY4n
LV Write Access read/write
LV Status available
# open 1
LV Size 50.00 GiB
Current LE 12800
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 252:5
--- Logical volume ---
LV Name /dev/eBox-Veneyarna/rootsnap
VG Name eBox-Veneyarna
LV UUID HQ0HGG-31Mq-IZR1-3LDy-WIMG-BrAa-IhVpIN
LV Write Access read/write
LV snapshot status INACTIVE destination for /dev/eBox-Veneyarna/root
LV Status available
# open 0
LV Size 262.37 GiB
Current LE 67166
COW-table size 200.00 GiB
COW-table LE 51200
Snapshot chunk size 8.00 KiB
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 252:3
Oliver Carreño
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