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Queued Unit Attentions are implemented on the tape drive and are maintained
separately for each valid LUN for each initiator. Unit Attentions are created as a
result of the following circumstances:
• Power on
• Bus reset
• Bus device reset message
• When the media may have changed asynchronously
• When another initiator has changed the mode parameters
• When a firmware (microcode) update has completed
Two (2) queued Unit Attentions are not unusual. For example, if a drive is
powered up and a cartridge is loaded, “power up” and “not ready to ready
transition” Unit Attention messages are created. Due to a limited number of Unit
Attention buffers, if an initiator does not clear Unit Attentions queued for it, the
tape drive at some point stops generating new Unit Attention messages for the
Initiator-Logical Unit (I-L) combination (existing messages remain queued).
A LOAD command does not generate a Unit Attention message for the initiator
that issued the command, since the transition to ready is synchronous.