Use the groupby clause of the vxdmpadm iostat command to display cumulative I/O statistics listings per DMP node, controller, array port id, or host-array controller pair and enclosure. If the groupby clause is not specified, then the statistics are displayed per path.

By default, the read/write times are displayed in milliseconds up to 2 decimal places. The throughput data is displayed in terms of BLOCKS, and the output is scaled, meaning that the small values are displayed in small units and the larger values are displayed in bigger units, keeping significant digits constant. You can specify the units in which the statistics data is displayed. The -u option accepts the following options:

To group by DMP node:

# vxdmpadm [-u unit] iostat show groupby=dmpnode \
[all | dmpnodename=dmpnodename | enclosure=enclr-name] 

The following example shows grouping by DMP node.

# vxdmpadm iostat show groupby=dmpnode dmpnodename=c5t0d1s2

OPERATIONS      BLOCKS          AVG TIME(ms)
DMPNODENAME  READS  WRITES   READS   WRITES  READS  WRITES
c5t0d1s2      0     0        0       0        0.00    0.00

To group by controller:

# vxdmpadm [-u unit] iostat show groupby=ctlr [ all | ctlr=ctlr ] 

For example:

# vxdmpadm iostat show groupby=ctlr ctlr=c5

              OPERATIONS        BLOCKS       AVG TIME(ms)
CTLRNAME    READS   WRITES  READS  WRITES  READS  WRITES
c5          224      14     54      7       4.20   11.10

To group by arrayport:

# vxdmpadm [-u unit] iostat show groupby=arrayport [ all \
| pwwn=array_pwwn | enclosure=enclr portid=array-port-id ]

For example:

# vxdmpadm -u m iostat show groupby=arrayport \
enclosure=HDS9500-ALUA0 portid=1A 

            OPERATIONS        BYTES       AVG TIME(ms)
PORTNAME  READS   WRITES  READS  WRITES  READS   WRITES
1A        743     1538    11m    24m     17.13   8.61

To group by enclosure:

# vxdmpadm [-u unit] iostat show groupby=enclosure [ all \
| enclosure=enclr ] 

For example:

# vxdmpadm -u h iostat show groupby=enclosure enclosure=EMC_CLARiiON0

                  OPERATIONS       BLOCKS       AVG TIME(ms)
ENCLRNAME       READS  WRITES  READS  WRITES  READS   WRITES
EMC_CLARiiON    743    1538    11392k  24176k 17.13   8.61

You can also filter out entities for which all data entries are zero. This option is especially useful in a cluster environment which contains many failover devices. You can display only the statistics for the active paths.

To filter all zero entries from the output of the iostat show command:

# vxdmpadm [-u unit] -z iostat show [all|ctlr=ctlr_name |
dmpnodename=dmp_device_name | enclosure=enclr_name [portid=portid] |
pathname=path_name|pwwn=port_WWN][interval=seconds [count=N]]

For example, to display the statistics for a dmpnodename and exclude the zero entries:

# vxdmpadm -z iostat show dmpnodename=c2t16d4s2

             OPERATIONS        BLOCKS        AVG TIME(ms)
PATHNAME   READS  WRITES    READS   WRITES  READS   WRITES
c3t16d4s2  10     110       2       25      12.00    27.96
c2t17d4s2  20     126       4       29       9.50    19.41

To display average read/write times in microseconds.

# vxdmpadm -u us iostat show pathname=c2t17d4s2

              OPERATIONS        BLOCKS        AVG TIME(microsec)
PATHNAME   READS  WRITES    READS   WRITES  READS     WRITES
c2t17d4s2  20     126       4       29      9500.00   19413.79