DM Resize a DM-Multipath Device

Resize an Online Multipath Device

1. Resize the LUN on the storage subsystem.
2. Find and record the device paths to the LUN.

   # multipath -l

3. Resize the the SCSI block device.

   # echo 1 > /sys/block/<device>/device/rescan

4. Resize the multipath device.

   # multipathd -k resize map <multipath_device>

5. Resize the filesystem (assuming no LVM or DOS partitions are used).

   # resize2fs /dev/mapper/<multipath_device>

Further Reading

1. Resizing an Online Multipath Device