Quantum DLT 8000 Manual descarregar pdf (Página 154)

SCSI Commands

5-10 Quantum DLT 8000 Tape System

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

Command Length in CDB

Data Out

(To Drive)

Data In

(To Initiator)

REPORT LUNS Allocation --- Supported LUNS List

REQUEST SENSE Allocation --- Sense Data (18)

RESERVE UNIT 0

(Extent List Option

not supported)

--- ---

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 --- --- ---

5.1.5 Unit Attention Condition

Queued Unit Attentions are implemented on the Quantum DLT 8000 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.

1 2 ... 149 150 151 152 153 154 155 156 157 158 159 ... 407 408

Sem comentários

Quantum DLT 8000 Manual Página 154