The following discussion explains the By Cluster and By Node Disk Statistics. The disk statistics reported in By Cluster and By Node formats are as follows:
The percentage of time that work was available for the disk. Reported only for By Node statistics.
The percentage of the work available, marked as Page I/O.
The percentage of the work available, marked as Swap I/O. This includes both swapping and modified page writing.
The number of I/O operations per second performed by the device.
The response time. This is the mean total service time, per I/O request, for the device in milliseconds. This is the total time taken to service an I/O request and is the sum of the queuing time and the busy time. It is thus measured from the time the I/O request is issued until the time the controller completes the request. This value is computed as (Average device queue length)/Rate.
The average number of disk I/O requests waiting for service.
The percentage of the total disk volume space that is allocated. Reported only for mounted disks.
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