Veritas Volume Manager 5.0.1 Administrator's Guide, HP-UX 11i v3, First Edition, November 2009

c3t2d15 state=enabled type=primary
c4t2d15 state=enabled type=primary
c4t3d15 state=enabled type=primary
c5t3d15 state=enabled type=primary
c5t4d15 state=enabled type=primary
In addition, the device is in the enclosure ENC0, belongs to the disk group mydg,
and contains a simple concatenated volume myvol1.
The first step is to enable the gathering of DMP statistics:
# vxdmpadm iostat start
Next the dd command is used to apply an input workload from the volume:
# dd if=/dev/vx/rdsk/mydg/myvol1 of=/dev/null &
By running the vxdmpadm iostat command to display the DMP statistics for the
device, it can be seen that all I/O is being directed to one path, c5t4d15:
# vxdmpadm iostat show dmpnodename=c3t2d15 interval=5 count=2
.
.
.
cpu usage = 11294us per cpu memory = 32768b
OPERATIONS KBYTES AVG TIME(ms)
PATHNAME READS WRITES READS WRITES READS WRITES
c2t0d15 0 0 0 0 0.00 0.00
c2t1d15 0 0 0 0 0.00 0.00
c3t1d15 0 0 0 0 0.00 0.00
c3t2d15 0 0 0 0 0.00 0.00
c4t2d15 0 0 0 0 0.00 0.00
c4t3d15 0 0 0 0 0.00 0.00
c5t3d15 0 0 0 0 0.00 0.00
c5t4d15 5493 0 5493 0 0.41 0.00
The vxdmpadm command is used to display the I/O policy for the enclosure that
contains the device:
# vxdmpadm getattr enclosure ENC0 iopolicy
ENCLR_NAME DEFAULT CURRENT
============================================
ENC0 Round-Robin Single-Active
Administering Dynamic Multipathing
Administering DMP using vxdmpadm
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