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.
Avg req queue length The average queue length of the requests that were issued to the device. Valid entry is an integer.
Avg req size The average size (in sectors) of the requests that were issued to the device. Valid entry is an integer.
Avg svc time The average service time (in milliseconds) for I/O requests that were issued to the device. Valid entry is an integer.
Avg wait time The average time (in milliseconds) for I/O requests issued to the device to be served. Valid entry is an integer.
Cpu Util Percentage of CPU time during which I/O requests were issued to the device. Saturation occurs at 100%.
Device Name Name of the device as appears under the /dev directory. Valid entry is an alphanumeric text string, 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.
Read bytes per sec The number of bytes read from the device per second.
Read req per sec The number of read requests that were issued, per second, to the device. Valid entry is an integer.
Read reqm per sec The number of read requests merged, per second, that were issued to the device. Valid entry is an integer.
Read sect per sec The number of sectors read, per second, from the device. Valid entry is an integer.
System Name Name of the host system. Valid entry is an alphanumeric text string, with a maximum length of 64 characters.
Timestamp The date and time the agent collects information as set on the monitored system. The timestamp format for SCAN and STR functions is CYYMMDDHHMMSSmmm (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
Transfers bytes per sec The number of bytes trasferred per second.
Write bytes per sec The number of bytes written to the device per second.
Write req per sec The number of write requests that were issued, per second, to the device. Valid entry is an integer.
Write reqm per sec The number of write requests merged that were issued, per second, to the device. Valid entry is an integer.
Write sect per sec The number of sectors written to the device, per second. Valid entry is an integer.