I/O Ext Attributes

The I/O Ext attributes refer to a wide variety of disk input/output characteristics, including read request rates, write request rates, and service time measures.

Note: These attributes are only available for systems with a 2.4 (or higher) kernel.

Average Request Queue Length The average queue length of the requests that were issued to the device. The following values are valid: integers. For example, the following value is valid: Value_Exceeds_Maximum=9223372036854775807.

Average Request Size (Sectors) The average size (in sectors) of the requests that were issued to the device. The following values are valid: integers. For example, the following value is valid: Value_Exceeds_Maximum=9223372036854775807.

Average Service time (ms) The average service time (in milliseconds) for I/O requests that were issued to the device. The following values are valid: integers. For example, the following value is valid: Value_Exceeds_Maximum=9223372036854775807.

Average Wait Time (ms) The average time (in milliseconds) for I/O requests issued to the device to be served. The following values are valid: integers. For example, the following value is valid: Value_Exceeds_Maximum=9223372036854775807.

Bytes Transferred Per Second The number of bytes transferred per second. For example, the following value is valid: Value_Exceeds_Maximum=9223372036854775807.

Device Name Name of the device as is displayed under the /dev directory. The following values are valid: alphanumeric text strings with a maximum length of 64 characters.

Disk Read Percent The percentage of time spent in read operations.

Disk Write Percent The percentage of time spent in write operations.

Percent CPU Time Used Percentage of CPU time during which I/O requests were issued to the device. Saturation occurs at 100%.

Read Bytes Per Second The number of bytes read from the device per second. For example, the following value is valid: Value_Exceeds_Maximum=9223372036854775807.

Read Requests Per Second The number of read requests that were issued, per second, to the device. The following values are valid: integers. For example, the following value is valid: Value_Exceeds_Maximum=9223372036854775807.

Read Requests Merged Per Second The number of read requests merged, per second, that were issued to the device. The following values are valid: integers. For example, the following value is valid: Value_Exceeds_Maximum=9223372036854775807.

Read Sectors Per Second The number of sectors read, per second, from the device. The following values are valid: integers. For example, the following value is valid: Value_Exceeds_Maximum=9223372036854775807.

System Name The managed system name. The form should be hostname:agent_code.

Examples include spark:LZ or deux.raleigh.ibm.com:LZ.

In workspace queries, this attribute should be set equal to the value $NODE$ in order to populate the workspace with data. This attribute is generally not included in situations, unless there is a need to customize the situation for a specific managed system.

Time Stamp The date and time the agent collects information as set on the monitored system. The timestamp for SCAN and STR functions is displayed in the CYYMMDDHHMMSSmmm format (as in 1020315064501000 for 03/15/02 06:45:01) where:

C = Century (0 for 20th, 1 for 21st)

Y = Year

M = Month

D = Day

H = Hour

M = Minute

S = Second

m = millisecond

Write Bytes Per Second The number of bytes written to the device per second. For example, the following value is valid: Value_Exceeds_Maximum=9223372036854775807.

Write Requests Per Second The number of write requests that were issued, per second, to the device. The following values are valid: integers. For example, the following value is valid: Value_Exceeds_Maximum=9223372036854775807.

Write Requests Merged Per Second The number of write requests merged that were issued, per second, to the device. The following values are valid: integers. For example, the following value is valid: Value_Exceeds_Maximum=9223372036854775807.

Write Sectors Per Second The number of sectors written to the device, per second. The following values are valid: integers. For example, the following value is valid: Value_Exceeds_Maximum=9223372036854775807.