Most Active RAID Arrays report

Shows up to four performance metrics for multiple arrays over time. Use the report to compare the performance metrics for arrays that are on storage systems.

Restriction: This report applies only to DS8000 systems.

Charts

The bar chart shows the most active RAID on DS8000, DS6000, and TotalStorage Enterprise Storage Server storage systems. By default, arrays are sorted by the I/O rate.
Tip: To change the sort order, select a value from the Sort Order list.

Report output

The information that is provided about the most active RAID is as follows:

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 Controller Name
The name that was assigned to the controller when it was added to the system.
Storage Pool Name
The name that was assigned to the pool when it was added to the system.
Storage RAID Array Name
The name that was assigned to the RAID array when it was added to the system.
Overall Response Time (ms/op)
The average number of milliseconds to complete an I/O operation. 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. This value includes both sequential and nonsequential operations.
Total Data Rate (MiB/s)
The average number of MiB per second that are transferred for read operations and write operations.
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.
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.
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.
Disk Utilization Percentage
The average percentage of time that the disks that are associated with an array are busy.
No value is calculated for this property if there are multiple ranks in the extent pool where the thin-provisioned volumes are allocated. In this case, the value N/A is displayed. This limitation applies only to DS8000 storage systems.
If there is only a single rank in the extent pool, the value for this property is calculated regardless of the thin-provisioned volumes.
Tip: Some highly sequential workloads such as batch or backup processing might continually exceed the threshold because they drive the arrays to high utilization percentages. For these types of workloads, a high utilization indicates that the work is being performed very efficiently and is not a cause for concern.

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 Performance of One Storage System
Controller Performance of One Controller or Module
RAID array Performance of One RAID Array