Performance of One Managed Disk report

Shows four charts, and a table of performance metrics for a managed disk over a time period. Use the report to analyze the performance of a managed disk.

Restriction: This report applies only to SAN Volume Controller, Storwize, and Hitachi Universal Storage Platform V systems.

Charts

The charts show the following performance statistics for a managed disk 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 MDisk Name
The name that was assigned to the managed disk when it was added to the system.
Back-End Read I/O Rate (ops/s)
The average number of read operations per second that are issued to the back-end storage resources.
Back-End Write I/O Rate (ops/s)
The average number of write operations per second that are issued to the back-end storage resources.
Total Back-End I/O Rate (ops/s)
The average number of I/O operations per second that are transmitted between the back-end storage resources and the component. This value includes both read and write operations.
Back-End Read Response Time (ms/op)
The average number of milliseconds for the back-end storage resources to respond to a read operation.
Back-End Write Response Time (ms/op)
The average number of milliseconds for the back-end storage resources to respond to a write operation.
Overall Back-End Response Time (ms/op)
The average number of milliseconds for the back-end storage resources to respond to a read or a write operation.
Back-End Read Data Rate (MiB/s)
The average number of MiB per second that are read from the back-end storage resources.
Back-End Write Data Rate (MiB/s)
The average number of MiB per second that are written to the back-end storage resources.
Total Back-End Data Rate (MiB/s)
The average rate at which data is transmitted between the back-end storage resources and the component. The rate is measured in MiB per second and includes both read and write operations.
Back-End Read Queue Time (ms/op)
The average number of milliseconds that a read operation spends in the queue before the operation is sent to the back-end storage resources.
Back-End Write Queue Time (ms/op)
The average number of milliseconds that a write operation spends in the queue before the operation is sent to the back-end storage resources.
Overall Back-End Queue Time (ms/op)
The average number of milliseconds that a read or a write operation spends in the queue before the operation is sent to the back-end storage resources.

Related reports

To open other reports that are related to a resource in this report, click the name of the resource. You can open the following related reports for the resources in this report:

Resource Related reports
Storage system Most Active Managed Disks
Storage pool Performance of One Pool