Resizing an Online Multipath Device

If you need to resize an online multipath device, use the following procedure:

1. Resize your physical device

2. Use the following command to find the paths to the LUN:

# multipath -l
3. Resize your paths. FOr SCSI devices, writing a 1 to the rescan file for the device causes the SCSI driver to rescan:

# echo 1 > /sys/block/device_name/device/rescan
4. Resize your multipath device by running the multipathd resize command:

# multipath -k’reisze map mpathX’
5. Resize the file system (assuming no LVM or DOS partition are used):

# resize2fs /dev/mapper/mpathX