MSA 2040 SMU Reference Guide

Glossary 179
Glossary
2U12 A enclosure that is two rack units in height and can contain 12 disks.
2U24 A enclosure that is two rack units in height and can contain 24 disks.
Additional Sense
Code/Additional Sense
Code Qualifier
See ASC/ASCQ.
Advanced Encryption
Standard
See AES.
AES Advanced Encryption Standard. A specification for the encryption of data using a
symmetric-key algorithm.
Air Management Sled See AMS.
ALUA Asymmetric Logical Unit Access.
AMS For a 2U12 or 2U24 enclosure, Air Management Sled. A drive blank designed to fill an
empty disk slot in an enclosure to maintain optimum airflow through the chassis.
array See storage system.
ASC/ASCQ Additional Sense Code/Additional Sense Code Qualifier. Information on sense data
returned by a SCSI device.
ASCII American Standard Code for Information Interchange. A character-encoding scheme that
encodes 128 characters. A subset with the decimal codes 32–126 are known as the
printable ASCII characters and include the space character, a–z, A–Z, 0–9, and basic
punctuation symbols. The ASCII character set is a subset of the UTF-8 character set.
See UTF-8.
auto-write-through See AWT.
available disk A disk that is not being used in a vdisk, is not configured as a spare, and is not in the
leftover state. It is available to be configured as a part of a vdisk or as a spare. See also
compatible disk, dedicated spare, dynamic spare, and global spare.
AWT Auto-write-through. A setting that specifies when the RAID controller cache mode
automatically changes from write-back to write-through.
CAPI Configuration Application Programming Interface. A proprietary protocol used for
communication between the Storage Controller and the Management Controller in a
controller module. CAPI is always enabled.
CHAP Challenge-Handshake Authentication Protocol.
chassis The sheetmetal housing of an enclosure.
chunk size The amount of contiguous data that is written to a vdisk member before moving to the next
member of the vdisk.
CIM Common Information Model. The data model for WBEM. It provides a common definition
of management information for systems, networks, applications and services, and allows for
vendor extensions.
CIM Query Language See CQL.
CIMOM Common Information Model Object Manager. A component in CIM that handles the
interactions between management applications and providers.
comma separated
values
See CSV.
Common Information
Model
See CIM.
Common Information
Model Object Manager
See CIMOM.