DM Resize a DM-Multipath Device

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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/<block device>/device/rescan
  4. Resize the multipath device.
    # multipathd -k'resize map <multipath device>'
  5. Resize the filesystem.
    # resize2fs /dev/mapper/<multipath device>

Further Reading

  1. Resizing an Online Multipath Device