Performance metrics for NetApp storage systems
Monitor the performance metrics that are collected for NetApp storage systems that are running ONTAP 9.
The following performance metrics are available for storage systems that are running ONTAP 9:
A performance metric might apply to one or more storage resources. To check which resources the performance metric applies to, see the tips.
Volume metrics
Volume performance metrics are divided into the following categories:
Tip: You can view the volume metrics in Key volume
metrics for the following resources:
- Volumes
- Pools
- Nodes
- Storage systems
| Metric | Description |
|---|---|
| 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. |
| 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. |
| 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 (Overall) | The average number of milliseconds to complete an I/O operation. This value includes both read and write operations. |
| Transfer Size (Read) | The average number of KiB that are transferred per read operation. |
| Transfer Size (Write) | The average number of KiB that are transferred per write operation. |
| Transfer Size (Overall) | The average number of KiB that are transferred per I/O operation. This value includes both read and write operations. |
Volume cache hit metrics are only available when you view the performance of nodes or storage systems. To check which resources a volume cache hit metric applies to, see the table footnotes.
| Metric | Description |
|---|---|
| Overall I/O Cache Hits (Read) %1 | 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. |
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Notes:
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Disk metrics
Disk performance metrics for NetApp storage systems that are running ONTAP 9 are described in Key disk metrics.Tip: You can view the disk metrics in Key disk metrics
for the following resources:
- Pools
- Disks
- Nodes
- Storage systems
| Metric | Definition |
|---|---|
| I/O Rate (Read) | The average number of read operations per second that are issued to the back-end storage resources. |
| I/O Rate (Write) | The average number of write operations per second that are issued to the back-end storage resources. |
| I/O Rate (Total) | 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. |
| 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. |
| Response Time (Read) | The average number of milliseconds for the back-end storage resources to respond to a read operation. |
| Response Time (Write) | The average number of milliseconds for the back-end storage resources to respond to a write operation. |
| Response Time (Overall) | The average number of milliseconds for the back-end storage resources to respond to a read or a write operation. |
| Transfer Size (Read) | The average number of KiB that are transferred per read operation from the back-end storage resources. |
| Transfer Size (Write) | The average number of KiB that are transferred per write operation to the back-end storage resources. |
| Transfer Size (Overall) | The average transfer size, in KiB, of a read or a write operation to the back-end storage resources. |
Port metrics
Port performance metrics are described in Key port metrics.
Tip: You can view the port metrics in Key port metrics
for the following resources:
- Ports
- Nodes
- Storage systems
| Metric | Description |
|---|---|
| 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 rate at which data is transferred through the port. The rate is measured in MiB per second and includes both send and receive operations. |
| 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. |
| 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. |
Node metrics
You can view the metrics in Key node metrics for storage systems.
| Metric | Description |
|---|---|
| System CPU | The average percentage of time that the processors on nodes are busy doing system I/O tasks. |
File system metrics
Unless otherwise noted, you can view the performance metrics in Key file system
metrics for the following resources:
- Pools
- Nodes
- File systems
- Storage systems
Tip: For a storage system, the metrics contain summary values for all of the file
systems on the storage system.
| Metric | Definition |
|---|---|
| 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 (Overall) | The average number of milliseconds to complete an I/O operation. This value includes both read and write operations. |
| 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. |
| Transfer Size (Read) | The average number of KiB that are transferred per read operation. |
| Transfer Size (Write) | The average number of KiB that are transferred per write operation. |
| Transfer Size (Overall) | The average number of KiB that are transferred per I/O operation. This value includes both read and write operations. |