Dell PowerVault MD3220 - Manual (Page 186)

186 Configuration: Device Mapper Multipath for Linux
Table 13-1. Device Mapper Commands
Command Descriptions
multipath -h Prints usage information
multipath -ll Displays the current multipath topology using all
available information (sysfs, the device mapper,
path checkers, and so on)
multipath Re-aggregates multipathing device with
simplified output.
multipath -f
<multipath_dev_node>
Flushes out Device Mapper for the specified
multipathing device. Used if the underlying
physical devices are deleted/unmapped.
multipath -F Flushes out all unused multipathing device maps.
rescan_dm_devs Dell provided script. Forces a rescan of the host's
SCSI bus and aggregates multipathing devices as
needed. For use when:
• LUNs are dynamically mapped to the hosts.
• New targets are added to the host.
• Failback of the storage array is required.
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