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Resizing an Online Multipath Device

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Article ID: 144
by: Reese K.
Posted: 27 Nov, 2013
Last updated: 27 Nov, 2013
Views: 3412

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

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