Performance metrics for managed disks on SAN Volume Controller and Storwize systems

A storage environment can include SAN Volume Controller systems, Storwize V7000 systems, and a Storwize V7000 Unified systems. You can include performance metrics for back-end arrays on managed disks on these systems in performance reports.

Back-end array data

You can create performance reports that include the following information:

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 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 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.
Peak Back-End Read Response Time (ms): The longest time for a back-end storage resource to respond to a read operation.
Peak Back-End Write Response Time (ms): The longest time for a back-end storage resource to respond to a write operation by a node.
Back-End Read Transfer Size (KiB/op): The average number of KiB that are transferred per read operation from the back-end storage resources.
Back-End Write Transfer Size (KiB/op): The average number of KiB that are transferred per write operation to the back-end storage resources.
Overall Back-End Transfer Size (KiB/op): The average transfer size, in KiB, of a read or a write operation to the back-end storage resources.
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.
Peak Back-End Read Queue Time (ms): The longest time that a read operation spends in the queue before the operation is sent to the back-end storage resources.
Peak Back-End Write Queue Time (ms): The longest time that a write operation spends in the queue before the operation is sent to the back-end storage resources.