SCSI Description

∙The tape medium is rewound to Beginning of Partition (BOP, i.e., Beginning of Tape [BOT]).

Note that the tape drive does not implement the hard reset alternative for bus RESET processing.

The tape drive recognizes multiple bus resets in succession as well as bus resets of arbitrarily long duration (powering on conditions). It recovers within the time limits specified above following the last bus reset.

3.6.3 Queued Unit Attentions

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.

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Quantum DLT 7000 Tape System

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Quantum Instruments DLT 7000 manual Queued Unit Attentions
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DLT 7000 specifications

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