RHEL5: dumpe2fs '-ob' option does not work, giving "No such file or directory"
Issue
- I am trying to use the '-ob' option of dumpe2fs to dump out backup superblock information. However I keep getting the following error, indicating 'No such file or directory', even though
dumpe2fs -fshows a valid backup superblock at 8193:
# dumpe2fs -ob 8193 /dev/vda1
dumpe2fs 1.39 (29-May-2006)
dumpe2fs: No such file or directory while trying to open 8193
Couldn't find valid filesystem superblock.
# dumpe2fs -f /dev/vda1 | grep super
dumpe2fs 1.39 (29-May-2006)
Filesystem features: has_journal ext_attr resize_inode dir_index filetype needs_recovery sparse_super
Primary superblock at 1, Group descriptors at 2-2
Backup superblock at 8193, Group descriptors at 8194-8194
Backup superblock at 24577, Group descriptors at 24578-24578
Backup superblock at 40961, Group descriptors at 40962-40962
Backup superblock at 57345, Group descriptors at 57346-57346
Backup superblock at 73729, Group descriptors at 73730-73730
Environment
- Red Hat Enterprise Linux 5
- ext3
- dumpe2fs from e2fsprogs
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