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Source: VCAVOA file at the DETAIL timespan
HARDVA file at the DAYS timespan
Function: Concisely summarizes the output of clustering,
including the number and percentage of volumes,
aggregate I/O rate and response times. The
results are split into two sections: "NORMAL",
which contains all volumes whose performance is
considered normal by statistical standards; and
"EXCEPTIONAL", which includes all volumes
operating outside of a normal range.
Examination of the "NORMAL" section provides a
high-level overview of subsystem performance and
can serve as a benchmark for additional studies.
Of greater interest is the "EXCEPTIONAL" section,
which identifies groups of volumes requiring
further analysis.
Features: Two different CA MICS files are combined to
produce this report; one provides space
information and the other provides performance
information. The HARDVA file can be filtered at
the hour or zone level so that the performance
information reflects a specific time period.
Volumes that appear in the HARDVA file but not the
VCAVOA file (because they were not scanned) can be
excluded by user option or may still appear on the
report, but will have 'N/A' or zeros in those
fields obtained from the VCAVOA file.
SMS N/A
Users:
COLUMN DESCRIPTIONS
Description
A text string indicating whether the volumes are
either "NORMAL" or "EXCEPTIONAL" in their
performance.
Cluster
The identifier of the cluster, an integer from one
to n.
Number of Volumes
The number of volumes represented by each cluster.
Percent of Volumes
The percentage of the total storage subsystem
represented by the volumes within each cluster.
Aggregate I/O Rate
The total I/O rate of all volumes within each
cluster.
Percent of I/O Activity
The percentage of all I/O operations by the
storage subsystem represented by the volumes
within each cluster.
Average Response Time
The average (mean) response time for all volumes
represented within each cluster.
Average Weighted Response Time
The mean response time weighted by the I/O rate
for all volumes represented within each cluster.
This metric is provided as an alternative to avoid
situations where the Average Response Time value
is seriously distorted by a small number of
outliers. The two response time measurements
ideally will be the same or very close in value.
A large difference in values indicates a
distortion of the Average Response Time values.
VOLUME CONFIGURATION (STGEPB) CA MICS StorageMate - SUMMARY AFTER COMPLEX SAS V8.2 Cluster Analysis of I/O Rate and Response Time Number Percent Aggregate Percent Average Avg. Wgtd. Description Cluster of of I/O Rate of I/O Response Response Volumes Volumes Activity Time Time Normal Volumes 6 1,641 80.64 51.8 7.56 0.004 0.003 15 218 10.71 52.4 7.64 0.014 0.006 14 79 3.88 73.0 10.65 0.002 0.002 12 22 1.08 8.5 1.24 0.010 0.008 8 8 0.39 13.2 1.93 0.001 0.001 16 2 0.10 3.2 0.46 0.002 0.002 ----------------- ------- ------- --------- -------- Normal Volumes 1,970 96.81 202.0 29.50 Exception Volumes 1 15 0.74 356.1 52.00 0.049 0.004 16 10 0.49 20.4 2.98 0.002 0.002 8 7 0.34 12.8 1.86 0.001 0.001 9 5 0.25 13.4 1.96 0.002 0.002 12 5 0.25 2.3 0.34 0.013 0.010 13 5 0.25 3.3 0.48 0.011 0.009 4 4 0.20 11.9 1.74 0.002 0.002 3 3 0.15 9.2 1.35 0.003 0.003 11 3 0.15 14.4 2.10 0.002 0.002 2 2 0.10 8.1 1.19 0.003 0.003 5 2 0.10 7.0 1.03 0.001 0.001 7 2 0.10 16.1 2.34 0.002 0.002 10 2 0.10 7.7 1.13 0.002 0.002 ----------------- ------- ------- --------- -------- Exception Volumes 65 3.19 482.9 70.50 ======= ======= ========= ======== 2,035 100.00 684.9 100.00
4-71A Cluster Analysis of I/O Rate and Response Time
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