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Chapter 1 Theory of Operation

Events

Quantum DX-Series Software Interface Guide 5

Events 1

Events are system conditions created by failures or operator actions, such

as changing the DX-Series system state to offline. Some events appear as

states on the control panel.

Events are recorded in sense data. Depending on the interface, the host

can obtain the sense data either in response to a Request Sense

command or as an unsolicited message.

The DX-Series system does not support asynchronous event notification.

This simplifies the host/DX-Series interface and is acceptable because

events happen infrequently and do not require an immediate host

response.

DX-Series system events are queued. To check for DX-Series system

events, the SCSI host can issue a Request Sense command to the device.

This command causes the DX-Series system to return event sense data.

The host can issue a Request Sense command repeatedly to obtain

sense data for each queued event.

The most significant events are detailed in this section:

• Power Cycle

• DX-Series Unit On-Line Initialization Failure

Power Cycle 1

When the DX-Series system is powered on, it generates a Power On/

Reset Occurred event (SK=6 ASC=29 ASCQ=00).

DX-Series Unit On-

Line Initialization

Failure

When a DX-Series system is placed on-line and initialization fails, the DX-

Series system generates an event for the error condition that caused the

failure.

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Quantum DPM5500 Guía de usuario Pagina 31