Veritas Volume Manager 5.0 Administrator's Guide (September 2006)

132 Administering dynamic multipathing (DMP)
Administering DMP using vxdmpadm
public: slice=0 offset=1152 len=4101723
private: slice=0 offset=128 len=1024
update: time=962923719 seqno=0.7
headers: 0 248
configs: count=1 len=727
logs: count=1 len=110
Defined regions:
config priv 000017-000247[000231]:copy=01 offset=000000
disabled
config priv 000249-000744[000496]:copy=01 offset=000231
disabled
log priv 000745-000854[000110]:copy=01 offset=000000
disabled
lockrgn priv 000855-000919[000065]: part=00 offset=000000
Multipathing information:
numpaths: 2
c1t0d3 state=enabled type=secondary
c4t1d3 state=disabled type=primary
In the Multipathing information section of this output, the numpaths line
shows that there are 2 paths to the device, and the following two lines show that the path to
c1t0d3 is active (state=enabled) and that the other path c4t1d3 has failed
(state=disabled).
The type field is shown for disks on Active/Passive type disk arrays such as the EMC
CLARiiON, Hitachi HDS 9200 and 9500, Sun StorEdge 6xxx, and Sun StorEdge T3
array. This field indicates the primary and secondary paths to the disk.
The type field is not displayed for disks on Active/Active type disk arrays such as the
EMC Symmetrix, Hitachi HDS 99xx and Sun StorEdge 99xx Series, and IBM ESS Series.
Such arrays have no concept of primary and secondary paths.
Administering DMP using vxdmpadm
The vxdmpadm utility is a command line administrative interface to the DMP feature of
VxVM. You can use the vxdmpadm utility to perform the following tasks.
■ Retrieve the name of the DMP device corresponding to a particular path.
■ Display the members of a LUN group.
■ List all paths under a DMP device node, HBA controller or array port.
■ Display information about the HBA controllers on the host.
■ Display information about enclosures.
■ Display information about array ports that are connected to the storage processors of
enclosures.