Disk and Partition Metrics

The agent reports metrics for each disk partition and for disks in aggregate. Only mounted partitions and local partitions are reported.

Note: SIGAR is not supported on Machine Agent.
Metric Name Description Basic or Server Visibility Windows Linux Solaris AIX Default Monitoring Mode
KB read/sec The number of KB per second read from all disks and partitions. Basic Advanced
KB written/sec The average amount of data per second written to all disks and partitions. Basic Advanced
Reads/sec Number of read operations per second performed on all disks and partitions. Basic KPI
Writes/sec Number of write operations per second performed on all disk and partitions. Basic 5 KPI
Avg IO Utilization (%) The average time spent processing read/write requests on all disks and partitions as a percentage of the total reported time window. Databases often report high disk I/O utilization due to frequent read/write requests. For example, if the agent detects read/write processing in 55 out of 60 seconds, the Avg IO Utilization for that minute is 92%. This metric does not measure the amount of available disk space or read/write request sizes. Server Visibility

KPI
<partition> %CPU Time The percentage of CPU processing consumed by a partition during read and write operations. Basic (HardwareMonitor)6 Diagnostic
<partition>Avg Service Time (ms) Time in milliseconds spent performing read and write operations across one partition. Basic (HardwareMonitor)6 Diagnostic
<partition>Avg Queue Time (ms) Time in milliseconds that a read or write request is in the queue before it gets processed across one partition. Basic (HardwareMonitor)6 KPI
<partition>KB read/sec The average amount of data per second read from one specific partition. Basic (HardwareMonitor)6 Diagnostic
<partition>KB written/sec The average amount of data per second written to one specific partition. Basic (HardwareMonitor)6 Diagnostic

<partition>Reads/sec

 Number of read operations per second performed on one specific partition. Basic (HardwareMonitor)6 KPI

<partition>Writes/sec

 Number of write operations per second performed on one specific partition. Basic (HardwareMonitor)6 5 KPI

<partition>Space Available

The amount of unused or free disk space on a specific partition in KB.

 Basic (HardwareMonitor)6

4

 KPI

<partition>Space Used

The amount of used or unavailable disk space on a specific partition in KB.

 Basic (HardwareMonitor)6

4 Advanced
<partition>Avg IO Utilization (%) The average time spent processing read/write requests as a percentage of the total reported time window. Databases often report high disk I/O utilization due to frequent read/write requests. For example, if the agent detects read/write processing in 55 out of 60 seconds, the Avg IO Utilization for that minute is 92%. This metric does not measure the amount of available disk space or read/write request sizes. Server Visibility KPI
<partition>Avg read time (ms) The average time in milliseconds required to service a read request by all disks or by one specific disk or across one partition. Server Visibility 2 KPI
<partition>Avg write time (ms) The average time in milliseconds required to service a write request across one partition. Server Visibility 2 KPI
<partition>Queue Time 95th Percentile3 The queue time for read/write requests was this long or shorter 95% of the time for the reported time window. Server Visibility KPI

1 See Default Monitoring Mode

2 For some versions of Windows Server 2008 and Windows Vista, the Hardware Resources|Disks|<partition>|Avg Read Time (ms) and Hardware Resources|Disks|<partition>|Avg Write Time (ms) metrics will be reported as 0. This is due to a known bug with Windows. To resolve this issue, download the hotfix: https://support.microsoft.com/en-us/kb/961435.

3 See Percentile Metric Reporting must be Enabled.

4See Configure Disk Usage Metric Collection on Linux..

5See HardwareMonitor and JavaHardwareMonitor Calculate "Writes/Sec" Differently on AIX Machines.

  • <MA-Home>/monitors/JavaHardwareMonitor : false
  • <MA-Home>/monitors/HardwareMonitor : true
  • <MA-Home>/extensions/ServerMonitoring/conf/ServerMonitoring.yaml : Set basicEnabled to true