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dual-redundant

Two controllers in one controller shelf providing the ability for one controller to

take over the work of the other controller in the event of a failure of the other

controller.

DUART

Dual universal asynchronous receiver transmitter. An integrated circuit

containing two serial, asynchronous transceiver circuits.

DUP

Diagnostic and Utility Protocol. Host application software that allows a host

operator terminal to connect to the controller’s command line interpreter. See

also virtual terminal.

ECC

error correction code. One or more cyclic redundancy check (CRC) words that

allow detection of a mismatch between transmitted and received data in a

communications system, or between stored and retrieved data in a storage

system. The ECC allows for location and correction of an error in the received

/retrieved data. All ECCs have limited correction power.

EDC

error detection code. One or more checksum words that allow detection of a

mismatch between transmitted and received data in a communications system,

or between stored and retrieved data in a storage system. The EDC has no data

correction capability.

ESD

electrostatic discharge. The discharge of a potentially harmful static electric

voltage as a result of improper grounding.

FAILEDSET

The FAILEDSET is a group of disk drives that have been removed from RAIDsets

due to a failure or a manual removal. Disk drives in the FAILEDSET should

be considered defective and should be tested, repaired, and then placed into the

SPARESET.

failover

Failover is the software process that takes place when one controller in a

dual-redundant conﬁguration fails and the other controller takes over the

devices of the failed controller and services them to the host until or if the failed

controller comes back or is replaced.

ﬂush

The act of writing data from the cache module to the media.

FRU

ﬁeld replaceable unit. A hardware component that can be replaced.

FWD SCSI

fast, wide, differential SCSI. The differential SCSI bus with a 16-bit data transfer

rate of up to 20 MB/s.

Glossary–3