Performance metrics for IBM FlashSystem 900
To review trends in performance for IBM FlashSystem 900 storage systems, you add performance metrics to performance charts. Use the charts to monitor the performance of the storage systems.
Overview
The performance metrics are described in the following sections:
Restrictions:
- IBM FlashSystem 900 storage systems do not track performance for individual volumes. The volume metrics that are available are provided to allow comparisons across different storage systems, but represent performance that is measured for ports rather than for volumes.
- IBM Storage Insights Pro supports only Fibre Channel adapters and ports that are installed on storage systems. For IBM FlashSystem 900 storage systems that have other types of ports, performance data is only available for the drives.
- Response time metrics are not available for all IBM FlashSystem 900 storage systems, depending on the firmware release of the storage system. To collect and view response time metrics, ensure that you have firmware level 1.4.5 or later.
Volume metrics
IBM FlashSystem 900 storage systems do not track the performance of individual volumes. Therefore, the performance metrics that you can view represent the sum of the measured performance of all the ports in the storage system.
| Metric | Description |
|---|---|
| Data Rate (Read) | The average number of MiBs per second that are transferred for read operations. |
| Data Rate (Write) | The average number of MiBs per second that are transferred for write operations. |
| Data Rate (Total) | The average number of MiB per second that are transferred for read operations and write operations. |
| Overall I/O Rate (Read) | The average number of read operations per second. This value includes both sequential and nonsequential read operations. |
| Overall I/O Rate (Write) | The average number of write operations per second. This value includes both sequential and nonsequential write operations. |
| Overall I/O Rate (Total) | The average number of read operations and write operations per second. This value includes both sequential and nonsequential operations. |
| Response Time (Read) | The average number of milliseconds to complete a read operation. |
| Response Time (Write) | The average number of milliseconds to complete a write operation. |
| Response Time (Total) | The average number of milliseconds to complete an I/O operation. This value includes both read and write operations. |
Disk metrics
You can view the following performance metrics for drives or flash modules on IBM FlashSystem 900 storage systems.
| Metric | Description |
|---|---|
| Data Rate (Read) | The average number of MiB per second that are read from the back-end storage resources. |
| Data Rate (Write) | The average number of MiB per second that are written to the back-end storage resources. |
| Data Rate (Total) | 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. |
| Flash Health Percentage | The overall flash module health. The health percentage is calculated based on the number of unusable blocks on the flash module. |
Port metrics
You can view the following port performance metrics for Fibre Channel ports on IBM FlashSystem 900 storage systems. No performance data is available for InfiniBand or FCoE ports.
| Metric | Description |
|---|---|
| Bandwidth (Send) | The percentage of the port bandwidth that is used for send operations. This value is an indicator of port bandwidth usage that is based on the speed of the port. |
| Bandwidth (Receive) | The percentage of the port bandwidth that is used for receive operations. This value is an indicator of port bandwidth usage that is based on the speed of the port. |
| Bandwidth (Total) | The percentage of the port bandwidth that is used for send and receive operations. This value is an indicator of port bandwidth usage that is based on the speed of the port. |
| Data Rate (Send) | The average rate at which data is sent from the port. The rate is measured in MiB per second. |
| Data Rate (Receive) | The average rate at which data is received by the port. The rate is measured in MiB per second. |
| Data Rate (Total) | The average rate at which data is transferred through the port. The rate is measured in MiB per second and includes both send and receive operations. |
| I/O Rate (Send) | The average number of I/O operations per second for operations in which data is sent from a port. |
| I/O Rate (Receive) | The average number of I/O operations per second for operations in which the port receives data. |
| I/O Rate (Total) | The average number of send operations and receive operations per second. |
| Response Time (Send) | The average number of milliseconds to complete a send operation. |
| Response Time (Receive) | The average number of milliseconds to complete a receive operation. |
| Response Time (Overall) | The average number of milliseconds to complete a send or receive operation. |
| Transfer Size (Send) | The average number of KiB that are transferred per send operation. |
| Transfer Size (Receive) | The average number of KiB that are transferred per receive operation. |
| Transfer Size (Overall) | The average number of KiB that are transferred per I/O operation. This value includes both send and receive operations. |