Configuring The System For Multipathing - Novell LINUX ENTERPRISE SERVER 10 SP3 - STORAGE ADMINISTRATION GUIDE 2-23-2010 Administration Manual

Display potential multipath devices, but do not create any devices and do not update device maps
(dry run):
multipath -d
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. For 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]
Specify one of the group policy options that are described in
Group Policy Options for the multipath -p Command
Table 5-3
Policy Option Description
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
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

5.4 Configuring the System for Multipathing

Section 5.4.1, "Preparing SAN Devices for Multipathing," on page 54
Section 5.4.2, "Partitioning Multipathed Devices," on page 54
Table 5-3 on page 53:
/etc/multipath.conf
location.
Managing Multipath I/O for Devices 53