Glossary
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3DC
three-data-center. Refers to the local, intermediate, and remote sites, or
data centers, in which TrueCopy and Universal Replicator combine to form
a remote replication configuration.
In a 3DC configuration, data is copied from a local site to an intermediate
site and then to a remote site (3DC cascade configuration), or from a
local site to two separate remote sites (3DC multi-target configuration).
A
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).
ALU
See administrative logical unit (ALU).
B
blade
A computer module, generally a single circuit board, used mostly in
servers.
Glossary 299
Hitachi Thin Image User Guide for Hitachi Virtual Storage Platform G Series and F Series
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