Performance of One Volume report

Shows four charts, and a table of performance metrics for a volume over a time period that you specify. Use the report to analyze the performance of a volume.

Charts

The charts show the following performance metrics for a volume on a storage system:

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, and the write date rates
The read cache percentages, the write cache percentages, and the volume utilization percentages

Report output

The following information is provided in the report for the period that you specified:

Storage System Name: A user-defined name of the storage system. If a name was not defined, IBM Spectrum Control shows the name that was defined when the storage system was added for monitoring.
Storage System Configuration: Shows whether a storage system is configured as back-end storage or configured to virtualize back-end storage. If this value is Storage System, the storage system is configured as back-end storage. If this value is Storage Virtualizer, the storage system is configured to virtualize back-end storage.
Storage Pool Name: The name that was assigned to the pool when it was added to the system.
Storage Volume Name: The name that was assigned to the storage volume when it was added to the system.
Overall Read I/O Rate (ops/s): The average number of read operations per second. This value includes both sequential and nonsequential read operations.
Overall Write I/O Rate (ops/s): The average number of write operations per second. This value includes both sequential and nonsequential write operations.
Total Overall I/O Rate (ops/s): The average number of read operations and write operations per second. This value includes both sequential and nonsequential operations.
Read Response Time (ms/op): The average number of milliseconds to complete a read operation.
Write Response Time (ms/op): The average number of milliseconds to complete a write operation.
Overall Response Time (ms/op): The average number of milliseconds to complete an I/O operation. This value includes both read and write operations.
Read Data Rate (MiB/s): The average number of MiBs per second that are transferred for read operations.
Write Data Rate (MiB/s): The average number of MiBs per second that are transferred for write operations.
Total Data Rate (MiB/s): The average number of MiB per second that are transferred for read operations and write operations.
Overall Read Cache Hit Percentage: The percentage of all read operations that find data in the cache. This value includes both sequential and random read operations, and read operations in the volume cache and volume copy cache where applicable.; You can use this value to understand throughput or response times. Low cache-hit percentages can increase response times because in the event of a cache miss, the data must be read from the back-end storage resources.
Overall Write Cache Hit Percentage: The percentage of all write operations that are handled in the cache. This value includes both sequential and random write operations, and write operations in the volume cache and volume copy cache where applicable.
Volume Utilization: The average percentage of time that the volume is busy.

Related reports

To open the Most Active Volumes report, click the name of the storage system in the report table.