ATTO EPCI-PWRC-000 Informations techniques télécharger pdf (Page 24)

ATTO Technology Inc. ATTO Express Power Center Installation and Operation Manual

Glossary

Some common terms used in the storage industry are defined below. More information about Fibre

Channel, SCSI, SAS and Storage Area Networks is available through the ATTO Technology website,

www.attotech.com

, the Fibre Channel Industry Association,

www.fibrechannel.org

, the SCSI Trade

Association,

www.scsita.org

, and the Storage Area Networking Industry Association,

www.snia.org

Term Definition

address a specific location in memory

ANSI American National Standards Institute

asynchronous a way of sending data over a bus in which an initiator sending data does not wait

for an acknowledgement (ACK) that the data has been received before sending

more data. Refer to “synchronous”.

block a sector of a disk which stores a group of bytes that must be read or written

together.

case sensitive a file system distinguishes between names which are the same but uses a different

case for some or all of the letters.

CRC Cyclic Redundancy Check: an error-correcting code which calculates a numeric

value for received and transmitted data. If no error has occurred during

transmission, the CRC for both received and transmitted data should be the same.

FC Fibre Channel

firmware software stored in read-only memory (ROM) or programmable ROM (PROM).

Firmware is often responsible for a system’s behavior when it is first switched on.

full duplex a communication protocol which allows transmission in both directions at the same

time

half duplex a communication protocol which allows transmission in both directions, but only

one direction at a time

hierarchical file

system

a file system commonly used on older Macintosh computers.

host a processor, usually a CPU and memory, which communicates with devices over

an interface

initiator device a component which originates a command

JBOD Just a Bunch Of Disks: a storage subsystem using multiple independent disk

drives with or without RAID configuration.

journaling feature which protects a file system’s integrity against power outages and other

disruptive events. It does not protect the user data buffer at the time of failure.

LUN Logical Unit Number: a SCSI or Fibre Channel identifier of a device

Mac OS X Extended a hierarchical file system (HFS+) which supports longer file names and volumes

than in older file systems.

Mac OS X Extended

(Journaled)

an HFS+ file system with journaling capability

Mac OS X Extended

(case sensitive)

an HFS+ file system with case sensitive capability

Mac OS X Extended

(case sensitive,

journaled)

an HFS+ file system with case sensitive and journaling capabilities

originator an initiating device; a component which originates a command

partition a logically separate portion of a disk used to allow multiple systems to coexist on a

single disk drive.

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ATTO EPCI-PWRC-000 Informations techniques Page 24

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