Hitachi G1500 - Page 177

Command Control Interface (CCI)
Softwar
e used to contr
ol volume r
eplication functionality (such as T
rueCopy or ShadowImage)
by means of commands issued from a host to a storage system. A command device must be
set up in the storage system to enable the storage system to receive commands from CCI.
In an open system, Replication Manager uses the CCI conguration denition les to modify
copy pair congurations and to acquire conguration information. Copy pair modication
processing, such as splitting and resynchronizing copy pairs, is executed on the storage
system via CCI.
command device
A dedicated logical volume used to interface with the storage system. Can be shared by
several hosts.
controller box
The enclosure that contains the storage system controller. For some models, disk drives may
be included as well. Controller boxes come in 2U and 3U versions.
■
CBL: AC-powered 3U controller box.
■
CBLE: AC-powered 2U controller box with support for encryption.
■
CBLD: DC-powered 3U controller box.
■
CBLE: 3U controller box that supports encryption.
■
CBSL controller box: A 3U controller box that can contain a maximum of 12 3.5-inch
drives.
■
CBSS controller box: A 2U controller box that can contain a maximum of 24 2.5-inch
drives.
■
CBXSL controller box: A 3U controller box that can contain a maximum of 12 3.5-inch
drives.
■
CBXSS controller box: A 2U controller box that can contain a maximum of 24 2.-5 inch
drives.
CRC
See cyclic redundancy check.
cyclic redundancy check (CRC)
An error-correcting code designed to detect accidental changes to raw computer data.
dierential management-logical unit
disaster recovery
A set of procedures to recover critical application data and processing after a disaster or other
failure. Disaster recovery processes include fallover and fallback procedures.
DMLU
See dierential management-logical unit.
Glossary
Hitachi Virtual Storage Platform G1000, G1500, and VSP F1500 Hardware Guide 177