SCSI Commands

Table 5–5 DATA-Phase Command Contents (Continued)

Command

Length in CDB

Data Out

(To

Data In

 

 

Drive)

 

(To Initiator)

 

 

 

 

 

REWIND

0

---

 

---

SEND DIAGNOSTIC

Parameter List

Diagnostic Page

---

SPACE

0

---

 

---

TEST UNIT READY

0

---

 

---

VERIFY

Transfer

Data

 

---

WRITE

Transfer

Data

 

---

WRITE BUFFER

Parameter List

Microcode Image

---

 

 

Data

 

 

WRITE FILEMARKS

---

---

 

---

 

 

 

 

 

5.1.5Unit Attention Condition

Queued Unit Attentions are implemented on the Quantum DLT 7000 tape drive and are maintained separately for each valid LUN for each initiator. Unit Attentions are created in each of the following circumstances:

∙At Power On

∙At Bus Reset

∙At Bus Device Reset message

∙When the medium may have changed asynchronously

∙When another initiator changes the Mode Parameters

∙When a firmware (microcode) update has completed

Two queued Unit Attentions are not unusual. For example, if a unit is powered up and a tape cartridge is loaded, Power Up and Not-Ready to Ready Transition Unit Attentions are created. Due to the limited number of Unit Attention buffers, if an initiator does not clear Unit Attentions queued for it, at some point the tape drive stops generating new Unit Attentions for that initiator- logical unit combination (existing ones will be left queued, however).

A LOAD command does not generate a Unit Attention for the initiator that issued the command since the transition to Ready is synchronous.

5-10

Quantum DLT 7000 Tape System

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Quantum Instruments DLT 7000 manual Unit Attention Condition, Scsi Commands DATA-Phase Command Contents
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DLT 7000 specifications

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