Most Active Storage Systems report

Shows a chart of the 20 storage systems that are most active, and details for all storage systems, for a time period that you specify. Use the report to analyze the performance of storage systems.

Charts

The bar chart shows the most active storage systems. By default, storage systems are sorted by the total 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 storage systems 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 System Location
The physical location of a storage system. The location is defined when a storage system is added to IBM Spectrum Control. You can add or edit the location of the storage system in the Properties pane of the storage system.
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.
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 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.

Related reports

To open related reports, click the name of the storage system and then click the name of the report. You can open the following related reports:

  • Most Active Host Connections
  • Most Active Nodes
  • Most Active IO Groups
  • Most Active Disks
  • Most Active Managed Disks
  • Most Active Pools
  • Most Active Ports
  • Most Active Volumes
  • Most Active Controllers or Modules
  • Most Active RAID Arrays
  • Performance of One Storage System
  • Storage Resource Relationships Summary