Error when trying to add external journal device to filesystem: 'Adding journal to device /dev/<device>: mkfs.ext4: Journal superblock not found'
Issue
- The
mkfs.ext4 -J device=/dev/<device> /dev/<device>command fails to add an external journal to a filesystem with one of the following errors:
# mkfs.ext4 -J device=/dev/mapper/VolGroup-lv_journal /dev/mapper/VolGroup-lv_fstest
...
Writing inode tables: done
Adding journal to device /dev/mapper/VolGroup-lv_journal: mkfs.ext4: Journal superblock not found
while trying to add journal to device /dev/mapper/VolGroup-lv_fstest
----------------------------
# mkfs.ext4 -J device=/dev/mapper/VolGroup-lv_journal /dev/mapper/VolGroup-lv_fstest
mke2fs 1.41.12 (17-May-2010)
mkfs.ext4: Bad magic number in super-block while trying to open journal device /dev/mapper/VolGroup-lv_journal
- The
mkfs.ext4command succeeds when ran without the-J deviceflag.
Environment
- Red Hat Enterprise Linux
- ext4 filesystem
- External journal device
Subscriber exclusive content
A Red Hat subscription provides unlimited access to our knowledgebase of over 48,000 articles and solutions.
Welcome! Check out the Getting Started with Red Hat page for quick tours and guides for common tasks.
