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:
# vxdmpadm [-u unit] iostat show groupby=dmpnode \ [all | dmpnodename=dmpnodename | enclosure=enclr-name]
# vxdmpadm [-u unit] iostat show groupby=ctlr [ all | ctlr=ctlr ]
# 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
# vxdmpadm [-u unit] iostat show groupby=arrayport [ all \ | pwwn=array_pwwn | enclosure=enclr portid=array-port-id ]
# 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
# vxdmpadm [-u unit] iostat show groupby=enclosure [ all \ | enclosure=enclr ]
# 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]]
# vxdmpadm -z iostat show dmpnodename=c2t16d4
OPERATIONS BLOCKS AVG TIME(ms) PATHNAME READS WRITES READS WRITES READS WRITES c3t16d4 10 110 2 25 12.00 27.96 c2t17d4 20 126 4 29 9.50 19.41
To display average read/write times in microseconds.
# vxdmpadm -u us iostat show pathname=c2t17d4
OPERATIONS BLOCKS AVG TIME(microsec) PATHNAME READS WRITES READS WRITES READS WRITES c2t17d4 20 126 4 29 9500.00 19413.79