Red Hat Summit5.2. Resizing an Online Multipath Device
If you need to resize an online multipath device, use the following procedure.
- Resize your physical device.
- Execute the following command to find the paths to the LUN:
multipath -l
# multipath -lCopy to Clipboard Copied! Toggle word wrap Toggle overflow - Resize your paths. For SCSI devices, writing a 1 to the
rescanfile for the device causes the SCSI driver to rescan, as in the following command:echo 1 > /sys/block/path_device/device/rescan
# echo 1 > /sys/block/path_device/device/rescanCopy to Clipboard Copied! Toggle word wrap Toggle overflow Ensure that you run this command for each of the path devices. For example, if your path devices aresda,sdb,sde, andsdf, you would run the following commands:echo 1 > /sys/block/sda/device/rescan echo 1 > /sys/block/sdb/device/rescan echo 1 > /sys/block/sde/device/rescan echo 1 > /sys/block/sdf/device/rescan
# echo 1 > /sys/block/sda/device/rescan # echo 1 > /sys/block/sdb/device/rescan # echo 1 > /sys/block/sde/device/rescan # echo 1 > /sys/block/sdf/device/rescanCopy to Clipboard Copied! Toggle word wrap Toggle overflow - Resize your multipath device by executing the
multipathd resizecommand:multipathd resize map multipath_device
# multipathd resize map multipath_deviceCopy to Clipboard Copied! Toggle word wrap Toggle overflow - Resize the file system (assuming no LVM or DOS partitions are used):
resize2fs /dev/mapper/mpatha
# resize2fs /dev/mapper/mpathaCopy to Clipboard Copied! Toggle word wrap Toggle overflow
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