Disk IO Performance Test

This test auto-discovers the physical disks on a server, and accurately points you to the disk that is currently experiencing a high level of I/O activity.

Target of the test : A Solaris/Linux/AIX host

Agent deploying the test : An internal agent

Outputs of the test : One set of results for each disk supported by the host

Configurable parameters for the test
  1. Test period - How often should the test be executed
  2. Host - The host for which the test is to be configured.
  3. TARGETDISKIORATE – Specify a positive integer value that represents the highest level of I/O activity (in KB/Sec) that can occur on a disk. If the actual I/O activity reported by this test exceeds the value configured here, the disk is said to be busy.
Measurements made by the test
Measurement Description Measurement Unit Interpretation

Disk IO

Indicates the rate at which I/O reads and writes occur on this disk.



Disk busy 

Indicates the percentage of time for which this disk was busy processing I/O requests.


This measure is reported only for those disks for which the value of the Disk IO measure is greater than or equal to the targetdiskiorate configured.

If this measure appears in the eG monitoring console for a disk, it clearly indicates that the said disk is busy.

Comparing the percentage of time that the different disks are busy, an administrator can determine whether the application load is properly balanced across the different disks.

Disk I/O at target busy 

Indicates whether this disk is busy processing requests or not.


If the value of the Disk IO measure is greater than or equal to the targetdiskiorate configured for this test, then, this measure will return the value 1; this indicates that the disk is busy.

If the value of the Disk IO measure falls below the targetdiskiorate  that has been configured, then the value of this measure will be 0; this indicates that the disk is not busy.