administrative logical unit (ALU)
An LU used for the conglomerate LUN structure, a SCSI architecture model. In the
conglomerate LUN structure, all host access is through the ALU, which functions as a
gateway to sort the I/Os for the subsidiary logical units (SLUs) grouped under the ALU.
The host requests I/Os by using SCSI commands to specify the ALU and the SLUs
grouped under the ALU. An ALU is called a Protocol Endpoint (PE) in vSphere.
See also subsidiary logical unit (SLU).
alternate path
A secondary path (port, target ID, LUN) to a logical volume, in addition to the primary
path, that is used as a backup in case the primary path fails.
array
Another name for a RAID storage system.
array group
See RAID group.
async
asynchronous
ATTIME suspend
A consistency group task in which multiple pairsplit operations are performed
simultaneously at a pre-determined time using BCM or CCI.
audit log
Files that store a history of the operations performed from Device Manager - Storage
Navigator and the service processor (SVP), commands that the storage system received
from hosts.
B
base emulation type
Emulation type that is set when drives are installed. Determines the device emulation
types that can be set in the RAID group.
BC
business continuity
blade
A computer module, generally a single circuit board, used mostly in servers.
BLK, blk
block
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Glossary-2
Hitachi TrueCopy® User Guide for Hitachi Virtual Storage Platform Gx00 and Fx00 Models
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