Multi-initiator Support

SCSI-attached drives support a maximum of two initiators on the same bus.

Fibre-Channel-attached drives support a minimum of two initiators.

The drive supports untagged queuing when operating with multiple initiators. If a command from one initiator is being processed when a command other than INQUIRY, REPORT LUNs, REQUEST SENSE, and TEST UNIT READY is received from a second initiator, the new command is queued. Commands (other than INQUIRY, REPORT LUNs, REQUEST SENSE, and TEST UNIT READY) from different initiators are always executed in strict order of receipt. For drives with a SCSI interface, if the queue is full or disconnect privilege is not granted in the new command, the drive reports busy status.

The INQUIRY, REPORT LUNs, REQUEST SENSE, and TEST UNIT READY commands are always processed immediately, irrespective of whether a command from another initiator is being processed.

The drive maintains sense data for the supported number of initiators. On Fibre-Channel-attached drives, if an additional initiator connects to the drive, the drive erases all sense data for the initiator that least recently connected before processing the command for the new initiator. See “Sense Data Management” on page 87 for more details of sense data management.

Status Codes

Table 111. Status Codes

Description

Value

When returned

 

 

 

Good

00h

The command completed without problems.

 

 

 

Check Condition

02h

A problem occurred during command execution. The

 

 

sense data should be examined to determine the nature of

 

 

the problem.

 

 

 

Condition Met

04h

This status is never returned, since no supported

 

 

commands generate this status.

 

 

 

Busy

08h

The drive is unable to accept the command at this time.

 

 

This status is returned during the power-on sequence or if

 

 

there are commands from too many initiators outstanding.

 

 

(See “Multi-initiator Support” on page 96.) It is also

 

 

returned when commands are issued without Disconnect

 

 

Privilege and when another command is in progress.

 

 

 

Intermediate

10h

This status is never returned, since Linked commands are

 

 

not supported.

 

 

 

Intermediate

14h

This status is never returned, since no supported

Condition met

 

commands generate this status.

 

 

 

Reservation Conflict

18h

This status is returned if the drive is reserved for an

 

 

initiator other than the one sending the command.

 

 

 

Command Terminated

22h

This status is never returned, since the terminate I/O

 

 

process message is not supported.

 

 

 

Queue Full

28h

This status is never returned, since tagged queuing is not

 

 

supported.

 

 

 

96Ultrium Internal Tape Drive and 3580 Ultrium Tape Drive: SCSI Reference

Page 110
Image 110
IBM T200F manual Multi-initiator Support, Status Codes, Description Value When returned

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