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143Administering dynamic multipathing (DMP)
Administering DMP using vxdmpadm
NAME ENCLR-NAME ARRAY-PORT-ID pWWN
==============================================================
c2t66d0 HDS9500V0 1A 20:00:00:E0:8B:06:5F:19
Displaying information about TPD-controlled devices
The third-party driver (TPD) coexistence feature allows I/O that is controlled by
third-party multipathing drivers to bypass DMP while retaining the monitoring
capabilities of DMP. The following commands allow you to display the paths
that DMP has discovered for a given TPD device, and the TPD device that
corresponds to a given TPD-controlled node discovered by DMP:
# vxdmpadm getsubpaths tpdnodename=TPD_node_name
# vxdmpadm gettpdnode nodename=DMP_node_name
See “Changing device naming for TPD-controlled enclosures” on page 94 for
information on how to select whether OS or TPD-based device names are
displayed.
For example, consider the following disks in an EMC Symmetrix array controlled
by PowerPath, which are known to DMP:
# vxdisk list
DEVICE TYPE DISK GROUP STATUS
emcpower10 auto:sliced disk1 ppdg online
emcpower11 auto:sliced disk2 ppdg online
emcpower12 auto:sliced disk3 ppdg online
emcpower13 auto:sliced disk4 ppdg online
emcpower14 auto:sliced disk5 ppdg online
emcpower15 auto:sliced disk6 ppdg online
emcpower16 auto:sliced disk7 ppdg online
emcpower17 auto:sliced disk8 ppdg online
emcpower18 auto:sliced disk9 ppdg online
emcpower19 auto:sliced disk10 ppdg online
The following command displays the paths that DMP has discovered, and which
correspond to the PowerPath-controlled node, emcpower10:
# vxdmpadm getsubpaths tpdnodename=emcpower10
NAME TPDNODENAME PATH-TYPE[-]DMP-NODENAME ENCLR-TYPE ENCLR-NAME
===================================================================
c7t0d10 emcpower10s2 - emcpower10 EMC EMC0
c6t0d10 emcpower10s2 - emcpower10 EMC EMC0
Conversely, the next command displays information about the PowerPath node
that corresponds to the path, c7t0d10, discovered by DMP:
# vxdmpadm gettpdnode nodename=c7t0d10
NAME STATE PATHS ENCLR-TYPE ENCLR-NAME
===================================================================
emcpower10s2 ENABLED 2 EMC EMC0