Fujitsu MAF3364FC, MAG3091FC, MAG3182FC manual Glossary

Models: MAG3182FC MAF3364FC MAG3091FC

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Glossary

Bus condition:

Asynchronous condition for causing SCSI bus status transition. There are

 

two types of bus conditions, ATTENTION and RESET.

 

Bus phase:

An SCSI bus state. The SCSI bus is in one of the following phases: BUS

 

FREE, ARBITRATION, SELECTION, RESELECTION,

or

 

INFORMATION TRANSFER. The INFORMATION TRANSFER phase

 

is divided into DATA IN, DATA OUT, COMMAND, STATUS,

 

MESSAGE IN, and MESSAGE OUT phases depending on the type of

 

information being transferred.

 

CCS:

Common Command Set. The standard SCSI logical specification

 

stipulated by a working committee of ANSI. Functions necessary for

 

direct access devices are defined.

 

CDB:

Command Descriptor Block. A group of data that describes the command

 

for I/O and is transferred from an initiator to a target.

 

Command:

Issued to a target to direct an input/output operation and written as CDB.

Disconnect:

Operation performed by the target to free itself from the SCSI bus and the

 

initiator temporarily when SCSI bus operation becomes unnecessary

 

during command processing.

 

Initiator:

SCSI device that has initiated an input/output operation on the SCSI

 

device. This is abbreviated as INIT.

 

Logical unit:

Simple unit of equipment that can be directed to perform one I/O

 

operation on the SCSI bus.

 

LUN:

Logical unit number used to identify a logical unit.

 

Message:

Information that controls a series of bus phases and I/O sequence between

 

the initiator and the target on the SCSI bus.

 

Reconnect:

Operation performed by the target to reconnect itself with the initiator

 

when operation on the SCSI bus becomes necessary after disconnection.

 

SCSI:

Small computer system interface. An input/output interface standardized

 

by the American National Standards Institute (ANSI). [Standard

 

number: ANSI X3.131-1986]

 

SCSI device:

General term for a device (Input/output device, I/O controller, and host

 

adapter, etc.) connected to an SCSI bus.

 

SCSI ID:

Physical device address used to identify an SCSI device on the SCSI bus.

 

This number is specific to each SCSI device. SCSI IDs are #0 to #7, each

 

referenced by a unique bit on the data bus.

 

Sense code:

One byte of code added to the sense data to identify the type of detected

 

error.

 

C141-E078-02EN

GL - 1

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Fujitsu MAF3364FC, MAG3091FC, MAG3182FC manual Glossary