NAME¶

vdoregenerategeometry - regenerate a VDO whose first few blocks have been wiped

SYNOPSIS¶

vdoregenerategeometry [options...] filename

DESCRIPTION¶

vdoregenerategeometry will attempt to regenerate the geometry block of a VDO device in the event that the beginning of the backing store was wiped. This tool will fail if enough of the device was wiped that the VDO super block was also erased, or if there are multiple valid super block candidates on the volume.

filename must be the path of the VDODataLV as described in lvmvdo(7). Since lvchange(8) will only mount that as read-only, a writable version of that device must be manually created, as shown in the example below.

If the super block location is known, or to select one of the candidate super blocks in the event that multiple candidates were found, the --offset option can be used to specify the location (in bytes) of the super block on the backing store.

OPTIONS¶

--help

Print this help message and exit.

--offset

Specify the location (in bytes) of the super block.

--version

Show the version of vdoregenerategeometry.

EXAMPLE¶

# lvchange -ay vdo1/vdo0pool_vdata
# dmsetup table vdo1-vdo0pool_vdata > vdata.table
# lvchange -an vdo1/vdo0pool_vdata
# dmsetup create vdo1-vdo0pool_vdata --table "`cat vdata.table`"
# vdoregenerategeometry /dev/mapper/vdo1-vdo0pool_vdata
# dmsetup remove vdo1-vdo0pool_vdata

SEE ALSO¶

lvmvdo(7), lvchange(8), dmsetup(8)