HP XP Racks - Manual (Page 750)

consistency time (C/T Time) The time indicated by the P-VOL I/O timestamp written to the S-VOL. If consistency is
preserved, it assures that the data statuses of the P-VOL and S-VOL match at a consistency time.
copy direction Flow of the data for matching the S-VOL data with the P-VOL data. In normal operation, data
always flows from a P-VOL to an S-VOL. When a failure occurs or when a return is made, data
may flow from an S-VOL to a P-VOL.
copy group A group of the several pair volumes that the user uses for the same operation.
copy group
container A set of multiple consistency groups with the same copy type. The whole copy group container
can be manipulated collectively.
copy group
container with
EXCTG ID specified When s are in a 4x4 configuration, consistency can be preserved between volumes in a copy
group container with multiple storage systems by assigning an EXCTG ID to the copy group
container. This will register the copy group container as an EXCTG on the storage systems.
copy pair A designated relationship between a primary volume (P-VOL) and a secondary volume (S-VOL)
in Business Continuity Manager.
copy pair matching
rate Rate at which pair P-VOL data matches pair S-VOL data.
copy pair status The status of a P-VOL and an S-VOL copy pair, for example SIMPLEX, DUPLEX, SUSPOP, or
PENDING.
copy pair structure Combination of a P-VOL (primary device) and an S-VOL (secondary device), and their connection
configuration.
CSA Common service area.
CSB Channel status byte.
CSL Callable Services Library.
CSV Comma-separated values.
CU Control unit.
D
DAD Device address domain. Indicates sites that adopt the same device numbering system. If several
hosts on the same site have the same device numbering system, they have the same name.
DASD Direct access storage device.
DBCS Double Byte Character Set.
DC Data center.
Delta Resync A method used in a 3DC Multi-Target configuration to synchronize a predefined delta resync
pair (a Cnt Ac-J pair consisting of a local site volume and a remote site volume) by copying only
the differences between the volumes in the pair.
Delta Resync pair A Cnt Ac-J copy pair for performing Delta Resync. This copy pair is either in HOLD, HOLDTRNS,
HOLDER, or NODELTA status.
device address A disk-numbering system that allows storage systems to use volumes. These addresses are displayed
as control units and command control addresses.
device address
domain ID (DAD ID) An identifier for a device address domain in Business Continuity Manager.
DEVN A device number used by a mainframe host to manage storage volumes.
DFSMS Data Facility Storage Management Subsystem.
difference
management unit A unit for managing differential data between a P-VOL and S-VOL. For Cnt Ac-S and TCA, track
or cylinder can be specified as the difference management unit.
differential copy Copy of the differential data used to match the contents of a P-VOL with those of an S-VOL (the
P-VOL and S-VOL form a copy pair) in the DUPLEX status when the copy pair is resynchronized.
differential data
rate Rate of the difference between the contents of a P-VOL and those of an S-VOL. A P-VOL and an
S-VOL form a copy pair.
750 Glossary