Veritas Volume Manager - display DMP IO statistics

If you are Veritas Volume Manager user you can use DMP to configure path failover and load balancing using many links (data paths) to storage. vxdmpadm is the command to do all the tasks. Just recently I had to check if data goes along configured links. You can achive this using the same vxdmpadm.

To enable the gathering of statistics use this command:

vxdmpadm iostat start

To reset the IO counters:

vxdmpadm iostat reset

To display the current statistics:

vxdmpadm -z iostat show all interval=60
                       cpu usage = 3037899us    per cpu memory = 32768b
                                   OPERATIONS            BLOCKS          AVG TIME(ms)
PATHNAME             READS    WRITES     READS    WRITES     READS    WRITES
c2t50060E80102C7770d16s2          99     43566      1584   1419358      0.55      0.03
c4t50060E80102C7772d16s2         101     37584      1616   1366880      0.74      0.17
c2t50060E80102C7770d21s2        2192      1623     87424     29072      0.11      0.04
c4t50060E80102C7772d21s2        1041      1059     46016     19840      0.16      0.24
...

The first output shows statistics from server boot. Next listings shows current data:

c2t50060E80102C7770d21s2           1         2        16        32      0.39      0.03
c4t50060E80102C7772d21s2           5         0        80         0      0.72      0.00
c2t50060E80102C7770d57s2           2         4        32       112      0.50      0.19
c4t50060E80102C7772d57s2           4         2        64        80      0.03      0.02
...
 

To disable the gathering of statistics use this command:

vxdmpadm iostat stop