host failover
The process of switching operations from one host to another host when
the primary host fails.
host group
A group of hosts of the same operating system platform.
I
I/O
input/output
I/O mode
I/O actions on the primary volume and secondary volume of a global-
active device pair.
in-system replication
The original data volume and its copy are located in the same storage
system. ShadowImage in-system replication provides duplication of
logical volumes; Thin Image in-system replication provides "snapshots" of
logical volumes that are stored and managed as virtual volumes (V-
VOLs).
See also remote replication.
initial copy
An initial copy operation is performed when a copy pair is created. Data
on the primary volume is copied to the secondary volume before any
updates are processed.
intermediate site (I-site)
A site that functions as both a TrueCopy secondary site and a Universal
Replicator primary site in a 3-data-center (3DC) cascading configuration.
internal volume
A logical volume whose data resides on drives that are physically located
within the storage system. See also external volume.
J
JNLG
See journal group (JNLG).
Glossary 305
Hitachi Thin Image User Guide for Hitachi Virtual Storage Platform G Series and F Series
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