D
data consistency
When the data on the secondary volume is identical to the data on the
primary volume.
data path
The physical paths used by primary storage systems to communicate with
secondary storage systems in a remote replication environment.
data pool
One or more logical volumes designated to temporarily store original
data. When a snapshot is taken of a primary volume, the data pool is
used if a data block in the primary volume is to be updated. The original
snapshot of the volume is maintained by storing the changeable data
blocks in the data pool.
delta resync
A disaster recovery solution in which TrueCopy and Universal Replicator
systems are configured to provide a quick recovery using only differential
data stored at an intermediate site.
device
A physical or logical unit with a specific function.
device emulation
Indicates the type of logical volume. Mainframe device emulation types
provide logical volumes of fixed size, called logical volume images (LVIs),
which contain EBCDIC data in CKD format. Typical mainframe device
emulation types include 3390-9 and 3390-M. Open-systems device
emulation types provide logical volumes of variable size, called logical
units (LUs), that contain ASCII data in FBA format. The typical open-
systems device emulation type is OPEN-V.
differential data
Changed data in the primary volume not yet reflected in the secondary
volume of a copy pair.
disaster recovery
A set of procedures to recover critical application data and processing
after a disaster or other failure.
302 Glossary
Hitachi Thin Image User Guide for Hitachi Virtual Storage Platform G Series and F Series
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