Updated Date: 07/07/2026
Device health metrics
The following list defines metrics sets and their corresponding metrics for the application statistics displayed in the dimensions pane table in the Device Health screen of the GUI. Each table row is read from left to right, where each metric set is defined as it would relate to each listed dimension, and each metric corresponds to its metric set.
|
Dimension |
Metric Set |
Metric Set Definition |
Metric |
Metric Definition |
|---|---|---|---|---|
|
BIG-IP Host Names BIG-IP Blades Process Name Process ID BIG-IP Modules |
CPU |
The percent CPU usage based on overall and specific activities of the BIG-IP system devices. |
System |
The average (percent) CPU usage for all the running BIG-IP systems over a given time period. |
|
User | ||||
|
I/O Wait |
The percentage of time (during the selected time period) that a given CPU is idle for an I/O wait operation. This occurs when at least one outstanding I/O disk operation is requested by a task scheduled on system CPU. | |||
|
Stolen |
The percentage of time a virtual CPU waits for real CPU when the hypervisor is servicing another virtual machine. | |||
|
Usage |
The percent CPU usage for the various processes used bu the BIG-IP system. | |||
|
BIG-IP Host Names BIG-IP Blades |
Memory Usage |
The percent RAM used by system processes of the BIG-IP system devices. |
Other |
The average percentage of used RAM from other device processes. |
|
TMM |
The average percentage RAM used by device TMM processes. | |||
|
Total |
The average percentage of RAM used by the system’s devices. | |||
|
BIG-IP Host Names BIG-IP Blades BIG-IP CPU Cores |
Disk Merges |
The average rate of merges per second (merge/s) at which an application completes a read or write to a hard disk. This indicated the speed of successful disk merges. |
Avg/s Read |
The average rate per second that an application completes a read merge from the hard disk. |
|
Avg/s Write |
The average rate per second that an application completes a read merge from the hard disk. | |||
|
BIG-IP Host Names BIG-IP Blades |
Disk Operations |
The average rate of operations per second (Ops) at which an application completes a read or write to a hard disk. This operation indicates the speed at which an application saves or extracts data from a hard disk. |
Avg/s Read |
The average rate per second that an application completes a write merge from the hard disk. |
|
Avg/s Write |
The average rate per second that an application completes a write operation to the hard disk. | |||
|
BIG-IP Host Names BIG-IP Blades |
Disk Throughput |
The average rate of bytes per second (Bps) that the application reads or writes from hard disk data. This indicates the speed of the application for the client. |
Avg/s Read |
The average rate per second of bytes that application reads from the hard disk. |
|
Avg/s Write |
The average rate per second of bytes that application writes to the hard disk. | |||
|
BIG-IP Host Names Interface Names |
Throughput Drops |
The average rate of packets per second (pps) that were dropped by the BIG-IP interface or discarded by the TMM over the course of the transaction. |
Avg/s Out |
The average rate of packets per second that were accepted by the BIG-IP interface, but discarded by the TMM. |
|
Avg/s In |
The average rate of packets per second that were dropped by the BIG-IP interface. | |||
|
Total Out |
The total number of packets that were accepted by the BIG-IP interface, but discarded by the TMM. | |||
|
Total In |
The total number of packets that were dropped by the BIG-IP interface. | |||
|
BIG-IP Host Names Interface Names |
Throughput Error |
The average rate packets per second (pps) that were corrupted or arrived incomplete over the course of the transaction across the network. |
Total In |
The total number of packets received as throughput error. |
|
Total Out |
The total number of packets transmitted out as throughput error. | |||
|
Avg/s In |
The average packets per second received as throughput error. | |||
|
Avg/s Out |
The average packets per second transmitted out at through |