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This is a very dangerous command. Document everything and backup everything when you use it.
Use the Linux multipath(8) command to configure and manage multipathed devices.
General syntax for the multipath(8) command:
multipath [-v verbosity] [-d] [-h|-l|-ll|-f|-F] [-p failover|multibus|group_by_serial|group_by_prio|group_by_node_name]
Configure multipath devices:
Configure a specific multipath device:
Replace devicename with the device node name such as /dev/sdb (as shown by udev in the $DEVNAME variable), or in the major:minor format.
Selectively suppress a multipath map, and its device-mapped partitions:
Display potential multipath devices, but do not create any devices and do not update device maps (dry run):
Configure multipath devices and display multipath map information:
multipath -v2 <device> multipath -v3
The -v2 option in multipath -v2 -d shows only local disks. Use the -v3 option to show the full path list.lliiFor example:
multipath -v3 -d
Display the status of all multipath devices, or a specified multipath device:
multipath -ll multipath -ll <device>
Flush all unused multipath device maps (unresolves the multiple paths; it does not delete the device):
multipath -F multipath -F <device>
Set the group policy:
multipath -p [failover|multibus|group_by_serial|group_by_prio|group_by_node_name]
Group Policy Options for the multipath -p Command
|failover||One path per priority group. You can use only one path at a time.|
|multibus||All paths in one priority group.|
|group_by_serial||One priority group per detected SCSI serial number (the controller node worldwide number).|
|group_by_prio||One priority group per path priority value. Paths with the same priority are in the same priority group. Priorities are determined by callout programs specified as a global, per-controller, or per-multipath option in the /etc/multipath.conf configuration file.|
|group_by_node_name||One priority group per target node name. Target node names are fetched in the /sys/class/fc_transport/target*/node_name location.|
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