Chapter 10: Using the SSD Cache Premium Feature
175
Then you can use a spreadsheet program outside of the storage management software
to compare the data from the
.csv
file. The performance modeling tool does not
support the loading of saved files.
The
.csv
File Information
The the
.csv
file shows the following information:
SSD Cache Capacity (GB)
– The amount of SSD cache capacity.
SSD Cache Hits (%)
– Derived from cache hits and total reads.
Average Overall Response Time
– This value is calculated by the software and
is not the result of averaging the response times for
SSD Reads (Cache Hits)
,
HDD Reads
, and
HDD Writes
.
Average Response Time (milliseconds)
– This value is the same as the
Average
Overall Response Time
in the next paragraph.
SSD Reads (Cache Hits)
– The total number of host reads of SSD cache-enabled
volumes that were satisfied from the SSD cache.
Average Response Time
– The average response time of the SSD reads (Cache
Hits).
Percentage of I/Os
– An indication of the percentage of SSD reads (Cache Hits).
HDD Reads
– The total number of host reads of SSD cache-enabled volumes.
Compare the reads relative to writes. The reads need to be greater than the writes
for effective SSD cache operation. The greater the ratio of reads to writes the
better the operation of the cache.
Average Response Time
– The average response time of the HDD reads.
Percentage of I/Os
– An indication of the percentage of HDD reads.
HDD Writes
– The total number of host writes to SSD cache-enabled volumes.
Compare the reads relative to writes. The reads need to be greater than the writes
for effective SSD cache operation. The greater the ratio of reads to writes the
better the operation of the cache.
Average Response Time
– The average response time of the HDD Writes.
Percentage of I/Os
– An indication of the percentage of HDD Writes.
Understanding SSD Cache Performance Modeling Results
When you run the performance modeling tool with a workload that has the same
characteristics as you run in production, the performance modeling tool collects this
type of information:
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