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

133Administering dynamic multipathing (DMP)
Administering DMP using vxdmpadm
■ Display information about devices that are controlled by third-party multipathing
drivers.
■ Gather I/O statistics for a DMP node, enclosure, path or controller.
■ Configure the attributes of the paths to an enclosure.
■ Set the I/O policy that is used for the paths to an enclosure.
■ Enable or disable I/O for a path, HBA controller or array port on the system.
■ Upgrade disk controller firmware.
■ Rename an enclosure.
■ Configure how DMP responds to I/O request failures.
■ Configure the I/O throttling mechanism.
■ Control the operation of the DMP path restoration thread.
The following sections cover these tasks in detail along with sample output.
The
vxdmpadm command can also be used to change the value of various DMP tunables.
See “Changing the values of tunables” on page 462.
For more information about the vxdmpadm command, see the vxdmpadm(1M) manual
page.
Retrieving information about a DMP node
The following command displays the DMP node that controls a particular physical path:
# vxdmpadm getdmpnode nodename=c3t2d1
The physical path is specified by argument to the nodename attribute, which must be a
valid path listed in the /dev/rdsk directory.
The above command displays output such as the following:
NAME STATE ENCLR-TYPE PATHS ENBL DSBL ENCLR-NAME
===============================================================
c3t2d1 ENABLED ACME 2 2 0 enc0
Use the enclosure attribute with getdmpnode to obtain a list of all DMP nodes for the
specified enclosure.
# vxdmpadm getdmpnode enclosure=enc0
NAME STATE ENCLR-TYPE PATHS ENBL DSBL ENCLR-NAME
===============================================================
c2t1d0 ENABLED ACME 2 2 0 enc0
c2t1d1 ENABLED ACME 2 2 0 enc0
c2t1d2 ENABLED ACME 2 2 0 enc0
c2t1d3 ENABLED ACME 2 2 0 enc0