Disk Unit Attributes

The Disk Unit attribute group contain attributes that you can use to monitor the performance of storage. Disk unit attributes allow you to collect data based on the cumulative value of disk unit counters.


Arm Number The unique identifier for the disk unit. The valid value is an alphanumeric string maximum of 4 characters.

Aux Storage Pool Number The auxiliary storage pool (ASP) to which the disk unit is currently allocated. The valid values include:

0

The disk unit is not allocated.

1

The disk unit is allocated to the system ASP.

2 through 16

The disk unit is allocated to the user ASP.

Average Queue Length The sum of the number of I/O operations awaiting service (including any operation in progress) at the end of each collection interval, divided by the number of collections taken during the last monitor interval. The valid value is an integer in the range 0 through 2147483647.

Average Service Time The average service time (in seconds) during the last monitor interval. The program calculates the number by dividing the percentage of samples where the disk arm is busy by the sum of read data commands and write data commands. The valid value is an integer in the range 0 through 2147483647. The attribute can be used with the *AVG, *MAX, *MIN, and *SUM functions.

Checksum Number Specifies the checksum set to which this unit is currently allocated. The valid values include:

0

The number is not currently assigned to a checksum value.

1 through 16

Checksum is set.

Drive Capacity The capacity of the drive in Kilobytes. The total number of bytes of auxiliary storage provided on the unit for the storage of objects and internal machine functions when the auxiliary storage pool (ASP) containing it is not under checksum protection. The valid value is an integer in the range 0 through 2147483647. The attribute can be used with the *AVG, *MAX, *MIN, and *SUM functions.

Drive Type The type of disk drive. The valid value is an alphanumeric string with a maximum of 4 characters.

IOP Bus Address The IOP bus address. The valid value is an integer in the range 0 through 31.

IOP Bus Number The IOP bus number. The valid value is an integer in the range 0 through 7.

IOP Name The system resource name associated with the IOP that controls this disk unit. The valid value is an alphanumeric string with a maximum of 10 characters.

ORIGINNODE The host name for the monitored system. The valid value is an alphanumeric string with a maximum length of 64 characters.

Percent Busy The percentage of time that the actuator for the disk unit is busy during the last monitor interval. An actuator moves the read and write heads within an auxiliary storage device. The valid value is an integer in the range 0 through 100. The attribute can be used with the *AVG, *MAX, *MIN, and *SUM functions.

Percent Permanent Used The percent of permanent disk capacity used (checksum case). The valid value is an integer in the range 0 through 100. The attribute can be used with the *AVG, *MAX, *MIN, and *SUM functions.

Percent Used The percentage of the capacity of the member that is currently being used. The valid value is an integer in the range 0 through 100. The attribute can be used with the *AVG, *MAX, *MIN, and *SUM functions.