Configuring The System For Multipathing; Preparing San Devices For Multipathing - Novell LINUX ENTERPRISE SERVER 10 SP2 - STORAGE ADMINISTRATION GUIDE 05-15-2009 Administration Manual

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 53
Section 5.4.2, "Partitioning Multipathed Devices," on page 54
Section 5.4.3, "Configuring the Server for Multipathing," on page 54
Section 5.4.4, "Adding multipathd to the Boot Sequence," on page 55
Section 5.4.5, "Creating and Configuring the /etc/multipath.conf File," on page 55

5.4.1 Preparing SAN Devices for Multipathing

Before configuring multipath I/O for your SAN devices, prepare the SAN devices, as necessary, by
doing the following:
Configure and zone the SAN with the vendor's tools.
Configure permissions for host LUNs on the storage arrays with the vendor's tools.
Table 5-3 on page 53:
/etc/multipath.conf
location.
Managing Multipath I/O for Devices 53