DASD MVS Devices attributes

The DASD MVS Devices Attribute Group permits you to monitor z/OS activity for individual DASD devices.

Address The device address for this DASD volume.

Cache Read Hit Percent This value represents a successful I/O request to read data from the cache. The ratio of successful reads to total read requests is the hit percentage. Valid value is a 4-byte integer.

Cache Status The cache status of the device for the system. Valid values are:

Cache Write Hit Percent This value represents a successful I/O request to write temporary data to the cache. The ratio of successful writes to total write requests is the hit percentage. Valid value is a 4-byte integer.

CU Busy Delay Time Control Unit busy delay time in milliseconds. Valid value is a 4-byte integer.

Dev Allocations Average number of allocated datasets that are open on the device.

Dev Busy Delay Time Device busy delay time in milliseconds. Valid value is a 4-byte integer.

Director Port Busy Delay ESCON Director Port busy delay time in milliseconds. Valid value is a 4-byte integer.

Fast Write Hit Percent This value represents write requests that are cached and later placed in nonvolatile storage (NVS) and written to the DASD device. Valid value is a 4-byte integer.

HyperPAV Indicates whether or not HyperPAV is enabled for this device. Valid values are yes and no.

I/O Connect Time The time, in milliseconds, attributable to data transfer (search + transfer). Valid value is a 4-byte integer.

I/O Disconnect Time The time, in milliseconds, that an I/O request spends freed from the channel. This is the time that the I/O searches for the data that has been requested. This includes moving the device to the requested cylinder and track (SEEK + SET SECTOR), waiting for the record to rotate under the head (LATENCY), and possible rotational delay as the device waits to reconnect to the channel (RPS delay). Valid value is a 4-byte integer.

I/O Pending Time The time, in milliseconds, that the I/O is delayed in the path to the device. Pending time may be attributable to the channel, control unit, or head of string being busy, although it is often caused by shared DASD. Valid value is a 4-byte integer.

I/O Rate Number of I/Os per second to the device. Valid value is a 4-byte integer.

IOS Queue Time The average time, in milliseconds, that an I/O waits because the device is busy. Valid value is a 4-byte integer.

LCU Number A device's Logical Control Unit (LCU) number (a number that represents the aggregate paths to the device). Valid value is a 4-byte integer in the range 0 - 255.

Model The control unit model type/number. Valid value is an 8-byte character string.

Managed System A z/OS operating system in your enterprise monitored by an Tivoli OMEGAMON XE on z/OS agent. Valid value is a character string with a maximum length of 32 bytes.

PAV Count The number of Parallel Access Volumes (PAVs) assigned to this DASD volume, or, in the case of base HyperPAV volumes, the average number of HyperPAV aliases assigned over the interval. If none, a value of Not available is displayed. Valid value is a 4-byte integer.

Percent Busy The percentage of time the device was busy doing I/O during the last measurement interval. Valid value is a 4-byte integer in the range 0.0 to 100.0.

Percent Reserve The percentage of time the device was observed to be in a Reserved state. Valid value is a 4-byte integer.

Response The average response time for I/Os to this device, in milliseconds.

Storage Group Name of the storage group to which the device is assigned. Valid value is an 8-byte character string.

Volume The volume serial number of the device. Valid value is a 6-byte character string.