Oracle Linux: e2label Returned Error "e2label: Bad magic number in super-block while trying to open /dev/VGExaDb/root_snap Couldn't find valid filesystem superblock" (Doc ID 2684498.1)

Last updated on SEPTEMBER 26, 2024

Applies to:

Symptoms

When trying to create snapshot for root Logical volume followed by labeling.e2label returned an error about superblock.

# lvcreate -L1G -s -c 32k -n root_snap /dev/VGExaDb/LVDbSys1
  Logical volume "root_snap" created.

--- Logical volume ---
  LV Path /dev/VGExaDb/root_snap
  LV Name root_snap
  VG Name VGExaDb
  LV UUID WfKekI-STCO-QiEL-R8c9-PViJ-duen-0YdeL0
  LV Write Access read/write
  LV Creation host, time et04dbadm01.joint.ladwp.com, 2020-06-03 18:13:02 -0700
  LV snapshot status active destination for LVDbSys1
  LV Status available
  # open 0
  LV Size 200.00 GiB
  Current LE 51200
  COW-table size 1.00 GiB
  COW-table LE 256
  Allocated to snapshot 0.05%
  Snapshot chunk size 32.00 KiB
  Segments 1
  Allocation inherit
  Read ahead sectors auto
  - currently set to 256
  Block device 252:14

# e2label /dev/VGExaDb/root_snap DBSYS_SNAP
e2label: Bad magic number in super-block while trying to open /dev/VGExaDb/root_snap Couldn't find valid filesystem superblock.
 

Cause

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