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141Administering dynamic multipathing (DMP)
Administering DMP using vxdmpadm
For A/P arrays in which the I/O policy is set to singleactive, only one path is
shown as ENABLED(A). The other paths are enabled but not available for I/O. If
the I/O policy is not set to singleactive, DMP can use a group of paths (all
primary or all secondary) for I/O, which are shown as ENABLED(A). See
“Specifying the I/O policy” on page 147 for more information.
Paths that are in the DISABLED state are not available for I/O operations.
You can use
getsubpaths to obtain information about all the paths that are
connected to a particular HBA controller:
# vxdmpadm getsubpaths ctlr=c2
NAME STATE[-] PATH-TYPE[-] CTLR-NAME ENCLR-TYPE ENCLR-NAMEATTRS
===================================================================
c2t1d0 ENABLED PRIMARY c2t1d0 ACME enc0 -
c2t2d0 ENABLED PRIMARY c2t2d0 ACME enc0 -
c2t3d0 ENABLED SECONDARY c2t3d0 ACME enc0 -
c2t4d0 ENABLED SECONDARY c2t4d0 ACME enc0 -
You can also use getsubpaths to obtain information about all the paths that are
connected to a port on an array. The array port can be specified by the name of
the enclosure and the array port ID, or by the worldwide name (WWN) identifier
of the array port:
# vxdmpadm getsubpaths enclosure=HDS9500V0 portid=1A
# vxdmpadm getsubpaths pwwn=20:00:00:E0:8B:06:5F:19
Displaying information about controllers
The following command lists attributes of all HBA controllers on the system:
# vxdmpadm listctlr all
CTLR-NAME ENCLR-TYPE STATE ENCLR-NAME
===============================================================
c1 OTHER ENABLED other0
c2 X1 ENABLED jbod0
c3 ACME ENABLED enc0
c4 ACME ENABLED enc0
This output shows that the controller c1 is connected to disks that are not in
any recognized DMP category as the enclosure type is OTHER.
The other controllers are connected to disks that are in recognized DMP
categories.
All the controllers are in the ENABLED state which indicates that they are
available for I/O operations.
The state DISABLED is used to indicate that controllers are unavailable for I/O
operations. The unavailability can be due to a hardware failure or due to I/O