Summarized Performance of Volumes by Host Connection report

Shows summarized performance metrics for volumes on a host connection. Use the report to identify the aggregate load and the average response time of a particular server.

Charts

The charts show the following performance statistics for the volumes on a host connection:
  • The total I/O rates and the total response times
  • The read I/O rates, the write I/O rates, the read response times, and the write response times
  • The read data rates, the write date rates, and the total data rates
  • The read cache percentages and the write cache percentages

Report output

The following information is provided in the report for the period that you specified:
Storage Host Connection Name
The user-defined name that describes the server or storage device that is assigned to a volume.
Overall Response Time (ms/op)
The average number of milliseconds to complete an I/O operation, across all volumes on the server. This value includes both read and write operations.
Total Overall I/O Rate (ops/s)
The average number of read operations and write operations per second, across all volumes on the server. This value includes both sequential and nonsequential operations. The average value for each volume is added to give a total I/O rate for all volumes on the server.
Total Data Rate (MiB/s)
The average number of MiB per second that are transferred for read operations and write operations, across all volumes on the server. The average value for each volume is added to give a total data rate for all volumes on the server.
Write Response Time (ms/op)
The average number of milliseconds to complete a write operation, across all volumes on the server.
Read Response Time (ms/op)
The average number of milliseconds to complete a read operation, across all volumes on the server.
Read Data Rate (MiB/s)
The average number of MiB per second that are transferred for read operations, across all volumes on the server. The average value for each volume is added to give a read data rate for all volumes on the server.
Write Data Rate (MiB/s)
The average number of MiB per second that are transferred for write operations, across all volumes on the server. The average value for each volume is added to give a write data rate for all volumes on the server.
Overall Read I/O Rate (ops/s)
The average number of read operations per second, which is totaled for all volumes on the server. This value includes both sequential and nonsequential read operations.
Overall Write I/O Rate (ops/s)
The average number of write operations per second, which is totaled for all volumes on the server. This value includes both sequential and nonsequential write operations.
Overall Read Cache Hit Percentage
The average percentage of all read operations that find data in the cache, across all volumes on the server. This value includes both sequential and nonsequential read operations.
You can use this value to understand throughput or response times. Low cache-hit percentages can increase response times because a cache miss requires access to the back-end storage resources.
Overall Write Cache Hit Percentage
The average percentage of all write operations that are handled in the cache, across all volumes on the server. This value includes both sequential and nonsequential write operations.

Related reports

To open the Performance of Volumes by Host Connection report, click the name of the host connection in the report table.