The attributes in this group are used to filter collection for DASD devices. When you create a situation for DASD device collection filtering, the program limits the amount of DASD device data sent to the CMS to the devices that meet the criteria of the situation. For an illustration of how to use DASD device collection filtering, see the chapter on “Monitoring Shared DASD” in IBM Tivoli OMEGAMON XE on z/OS: User's Guide.
Address Device address for the system in hexadecimal.This attribute is not recommended for use in selecting devices. DASD volumes may be reorganized over device addresses from time to time.
Average Response Time Average I/O response time, in milliseconds, of the device as seen by the system. The valid format is numeric values, including the use of the *AVG, *MAX, *MIN, or *SUM functions in the range of 0 to 2147483647, one decimal point precision. Use this attribute to select devices that might have problems.
Cache Status Cache status of the device for the system. Valid values include:
Connect Time Average connect time, in milliseconds, for a typical I/O. The valid format is numeric values, including the use of the *AVG, *MAX, *MIN, or *SUM functions in the range of 0 to 2147483647 with one decimal point precision.
Control Unit Type Control unit type. The valid values include:
Device Contention Index Device contention index value. Device contention is an indication of I/O delay for this group caused by inter system contention for the device. The larger the number the more severe is the contention. The valid format is numeric values, including the use of the *AVG, *MAX, *MIN, or *SUM functions. In the range of 0 to 2147483647 with two decimal point precision; for example, 1.35.
Device Type The device type. Valid format is 3380 or 3390.
Disconnect Time Average disconnect time, in milliseconds, for a typical I/O. Disconnect time is the time that the I/O searches for the data that has been requested. It includes moving the device to the requested cylinder and track (SEEK + SET SECTOR) waiting for the record to rotate under the head (LATENCY) possible rotational delay as the device waits to reconnect to the channel (RPS delay). The valid format is numeric values, including the use of the *AVG, *MAX, *MIN, or *SUM functions. In the range of 0 to 2147483647 with one decimal point precision; for example, 11.3.
Group Name Name of the DASD group. The valid format is simple text strings of 1 through 30 characters; for example, SGDB2X.
I/O Rate Average I/O rate for the device. The valid format is numeric values, including the use of the *AVG, *MAX, *MIN, or *SUM functions. In the range of 0 to 2147483647 with one decimal point precision; for example, 12.8.
Indexed VTOC Status of indexed VTOC as seen from the system. The valid values include:
On heavily used volumes with many data sets, an index to a volume table of contents may improve I/O performance.
IOSQ Average IOS queue time, in milliseconds, for a typical I/O. The valid format is numeric values, including the use of the *AVG, *MAX, *MIN, or *SUM functions. In the range of 0 to 2147483647 with one decimal point precision; for example, 15.5.
Mount Status Mount status of the device for the system. The valid values include:
Pending Time Average pending time, in milliseconds, for a typical I/O. Although shared DASD often causes high pending time, it can be caused by channel, control unit, or head of string being busy. Use this attribute for filtering. The valid format is numeric values, including the use of the *AVG, *MAX, *MIN, or *SUM functions. In the rang e of 0 to 2147483647 with one decimal point precision; for example, 5.5.
Reconfiguration Status Dynamic reconfiguration status of device for the system. The valid values include:
System Name of the system that shares access to this device. The valid format is simple text strings of 1 through 32 characters; for example, SYSA.
True Percent Busy Device true busy value aggregated over all systems in the Sysplex. The valid format is numeric values, including the use of the *AVG, *MAX, *MIN, or *SUM functions. In the range of 0 to 100 with one decimal point precision; for example, 25.5.
Vary Status Vary status of device for the system. The valid values include:
Volume Serial Number Volume serial number. The valid format is a simple text string of 1 through 6 characters; for example, VOL001. When used in a situation, ensures that certain devices are included for collection. It should be specified as a predicate that is joined by the OR operator to all other predicates. You can also include a group of devices by ending the volume serial number with an asterisk (*). For example, SYS*, would select all devices beginning with the characters SYS*.