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Home > Success Center > Storage Resource Monitor (SRM) > SRM Documentation > SRM 6.6 Administrator Guide > Use SRM resources > Performance Summary

Performance Summary

Table of contents

Updated March 14th, 2017


This resource displays stacked performance metric charts for the selected storage object. Move the cursor over the chart to compare values for all metrics for a specific polling time.

These charts show totals for each metric: click the gray triangle to expand, showing individual charts for read, write and other metrics.

Click on the label of a metrics to open as its own resource.

IOPS The number of Input/output operations per second for the selected device.
Latency The time required to process a single input/output transaction. This is from the receipt of the input/output request to the request being acknowledged.
Throughput The amount of data transferred per second.
IO Size The average size of an input-output operation. This is calculated as the number of transferred bytes divided by the number of input/output operations.
R/W IOPS Ratio The ratio of read to write operations on this object.
Cache Hit Ratio

The ratio of cache hits to misses, expressed as a percentage.

  • A cache hit is when data requested for processing is found in cache memory
  • A cache miss is when data requested for processing is not found in cache memory

You can display performance data for the last hour, the last 12 hours, or the last 24 hours using the Zoom buttons, or set the start and end points from the historical data selection to select a custom period, by setting the start and end points from the historical data selection shown below the charts.

All performance data in SRM for storage arrays and pools are aggregated from the associated LUNs. SRM does not take into account snapshot performance data.

Click Edit to customize the Performance Summary resource. You can:

  • Change the title and subtitle of the resource.
  • Change the default zoom range, the amount of historical data (up to one year), and the sample interval for summarizing data.
  • Add an additional title and subtitle to the chart.

Hitachi arrays

Because Hitachi SMI-S providers do not provide IOTimeCounter values, latency for HDS arrays cannot be calculated, and therefore is not displayed.

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