VERITAS Volume Manager 4.1 Administrator's Guide

Administering Dynamic Multipathing (DMP)
Administering DMP Using vxdmpadm
Chapter 3138
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
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
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
c3t115d0 0 0 0 0 0.000000 0.000000
cpu usage = 59us per cpu memory = 4096b
OPERATIONS BYTES AVG TIME(ms)
PATHNAME READS WRITES READS WRITES READS WRITES