VERITAS Volume Manager 4.1 Administrator's Guide

Administering Dynamic Multipathing (DMP)
Administering DMP Using vxdmpadm
Chapter 3 139
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Setting the Attributes of the Paths to an Enclosure
You can use the vxdmpadm setattr command to set the following attributes of the paths to
an enclosure or disk array:
• active
Changes a standby (failover) path to an active path. The example below specifies an active
path for an A/P-C disk array:
# vxdmpadm setattr path c2t10d0 pathtype=active
• nomanual
Restores the original primary or secondary attributes of a path. This example restores the
attributes for a path to an A/P disk array:
# vxdmpadm setattr path c3t10d0 pathtype=nomanual
• nopreferred
Restores the normal priority of a path. The following example restores the default priority
to a path:
# vxdmpadm setattr path c1t20d0 pathtype=nopreferred
• preferred priority=N
Specifies a path as preferred and assigns a priority number to it. The priority number
must be an integer that is greater than or equal to one. Higher priority numbers indicate
that a path is able to carry a greater I/O load.
NOTE Setting a priority for path does not change the I/O policy. The I/O policy
must be set independently as described in “Specifying the I/O Policy” on
page 125.
This example first sets the I/O policy to priority for an Active/Active disk array, and then
specifies a preferred path with an assigned priority of 2:
# vxdmpadm setattr enclosure enc0 iopolicy=priority
# vxdmpadm setattr path c1t20d0 pathtype=preferred \
priority=2
• primary