HP Veritas Volume Manager 5.0 -UX 11i v3 manual # vxdmpadm iostat start memory=4096

			Administering dynamic multipathing (DMP)				145
				Administering DMP using vxdmpadm
c2t115d0	87	0	44544	0	0.001200	0.000000
c3t115d0	0	0	0	0	0.000000	0.000000
c2t103d0	87	0	44544	0	0.007315	0.000000
c3t103d0	0	0	0	0	0.000000	0.000000
c2t102d0	87	0	44544	0	0.001132	0.000000
c3t102d0	0	0	0	0	0.000000	0.000000
c2t121d0	87	0	44544	0	0.000997	0.000000
c3t121d0	0	0	0	0	0.000000	0.000000
c2t112d0	87	0	44544	0	0.001559	0.000000
c3t112d0	0	0	0	0	0.000000	0.000000
c2t96d0	87	0	44544	0	0.007057	0.000000
c3t96d0	0	0	0	0	0.000000	0.000000
c2t106d0	87	0	44544	0	0.007247	0.000000
c3t106d0	0	0	0	0	0.000000	0.000000
c2t113d0	87	0	44544	0	0.007235	0.000000
c3t113d0	0	0	0	0	0.000000	0.000000
c2t119d0	87	0	44544	0	0.001390	0.000000
c3t119d0	0	0	0	0	0.000000	0.000000

The following command changes the amount of memory that vxdmpadm can use to accumulate the statistics:

#vxdmpadm iostat start memory=4096

The displayed statistics can be filtered by path name, DMP node name, and enclosure name (note that the per-CPU memory has changed following the previous command):

#vxdmpadm iostat show pathname=c3t115d0

		cpu usage = 8132us		per cpu memory = 4096b
		OPERATIONS	BYTES		AVG TIME(ms)
PATHNAME	READS	WRITES	READS	WRITES	READS	WRITES
c3t115d0	0	0	0	0	0.000000	0.000000

#vxdmpadm iostat show dmpnodename=c0t0d0

		cpu usage = 8501us		per cpu memory = 4096b
	OPERATIONS		BYTES		AVG TIME(ms)
PATHNAME	READS	WRITES	READS	WRITES	READS WRITES
c0t0d0	1088	0	557056	0	0.009542 0.000000

#vxdmpadm iostat show enclosure=Disk

		cpu usage = 8626us		per cpu memory = 4096b
	OPERATIONS		BYTES		AVG TIME(ms)
PATHNAME	READS	WRITES	READS	WRITES	READS WRITES
c0t0d0	1088	0	557056	0	0.009542 0.000000

You can also specify the number of times to display the statistics and the time interval. Here the incremental statistics for a path are displayed twice with a

2-second interval:

#vxdmpadm iostat show pathname=c3t115d0 interval=2 count=2

		cpu usage = 8195us		per cpu memory = 4096b
	OPERATIONS		BYTES		AVG TIME(ms)
PATHNAME	READS	WRITES	READS	WRITES	READS WRITES