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| Examples of gathering and displaying DMP I/O statistics using the vxdmpadm iostat command | ||
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| Examples of gathering and displaying DMP I/O statistics using the vxdmpadm iostat command | ||
|---|---|---|
| Prev | Gathering and displaying DMP I/O statistics | Next |
The following is an example session using the vxdmpadm iostat command. The first command enables the gathering of I/O statistics:
# vxdmpadm iostat start
The next command displays the current statistics including the accumulated total numbers of read and write operations, and the kilobytes read and written, on all paths.
# vxdmpadm -u k iostat show all
cpu usage = 7952us per cpu memory = 8192b
OPERATIONS BYTES AVG TIME(ms)
PATHNAME READS WRITES READS WRITES READS WRITES
c0t0d0 1088 0 557056k 0 0.00 0.00
c2t118d0 87 0 44544k 0 0.00 0.00
c3t118d0 0 0 0 0 0.00 0.00
c2t122d0 87 0 44544k 0 0.00 0.00
c3t122d0 0 0 0 0 0.00 0.00
c2t115d0 87 0 44544k 0 0.00 0.00
c3t115d0 0 0 0 0 0.00 0.00
c2t103d0 87 0 44544k 0 0.00 0.00
c3t103d0 0 0 0 0 0.00 0.00
c2t102d0 87 0 44544k 0 0.00 0.00
c3t102d0 0 0 0 0 0.00 0.00
c2t121d0 87 0 44544k 0 0.00 0.00
c3t121d0 0 0 0 0 0.00 0.00
c2t112d0 87 0 44544k 0 0.00 0.00
c3t112d0 0 0 0 0 0.00 0.00
c2t96d0 87 0 44544k 0 0.00 0.00
c3t96d0 0 0 0 0 0.00 0.00
c2t106d0 87 0 44544k 0 0.00 0.00
c3t106d0 0 0 0 0 0.00 0.00
c2t113d0 87 0 44544k 0 0.00 0.00
c3t113d0 0 0 0 0 0.00 0.00
c2t119d0 87 0 44544k 0 0.00 0.00
c3t119d0 0 0 0 0 0.00 0.00
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 -u k iostat show pathname=c3t115d0s2
cpu usage = 8132us per cpu memory = 4096b
OPERATIONS BYTES AVG TIME(ms)
PATHNAME READS WRITES READS WRITES READS WRITES
c3t115d0s2 0 0 0 0 0.00 0.00
# vxdmpadm -u k iostat show dmpnodename=c0t0d0s2
cpu usage = 8501us per cpu memory = 4096b
OPERATIONS BYTES AVG TIME(ms)
PATHNAME READS WRITES READS WRITES READS WRITES
c0t0d0s2 1088 0 557056k 0 0.00 0.00
# vxdmpadm -u k iostat show enclosure=Disk
cpu usage = 8626us per cpu memory = 4096b
OPERATIONS BYTES AVG TIME(ms)
PATHNAME READS WRITES READS WRITES READS WRITES
c0t0d0s2 1088 0 57056k 0 0.00 0.00
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 dmpnodename=emc_clariion0_342 interval=1 count=2
cpu usage = 164687us per cpu memory = 409600b
OPERATIONS BLOCKS AVG TIME(ms)
PATHNAME READS WRITES READS WRITES READS WRITES
c0t5006016041E03B33d6s2 3 0 33 0 0.02 0.00
c0t5006016141E03B33d6s2 3 0 3 0 0.16 0.00
c0t5006016841E03B33d6s2 0 0 0 0 0.00 0.00
c1t5006016041E03B33d6s2 1 0 16 0 0.02 0.00
c1t5006016141E03B33d6s2 2 0 2 0 0.18 0.00
c1t5006016841E03B33d6s2 0 0 0 0 0.00 0.00
c0t5006016041E03B33d6s2 0 0 0 0 0.00 0.00
c0t5006016141E03B33d6s2 0 0 0 0 0.00 0.00
c0t5006016841E03B33d6s2 0 0 0 0 0.00 0.00
c1t5006016041E03B33d6s2 0 0 0 0 0.00 0.00
c1t5006016141E03B33d6s2 0 0 0 0 0.00 0.00
c1t5006016841E03B33d6s2 0 0 0 0 0.00 0.00