HP XP P9500 Storage - Manual (Page 121)

is resynchronized, the cylinder bitmaps are merged, and the differential data is copied to the
secondary volume.
DASD direct-access storage device
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 to-be-changed data
blocks in the data pool.
DB database
DBMS database management system
delta resync A disaster recovery solution in which Continuous Access Synchronous and Continuous Access
Journal 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.
DEVN device number
DFW DASD fast write
DHCP dynamic host configuration protocol
differential data Changed data in the primary volume not yet reflected in the copy.
disaster recovery A set of procedures to recover critical application data and processing after a disaster or other
failure.
disk adapter (DKA) The hardware component that controls the transfer of data between the drives and cache. A DKA
feature consists of a pair of boards.
disk array Disk array, or just array, is another name for a RAID storage system.
disk controller
(DKC) The hardware component that manages front-end and back-end storage operations. The term
DKC is sometimes used to refer to the entire RAID storage system.
DKA See disk adapter (DKA).
DKC disk controller. Can refer to the RAID storage system or the controller components.
DKCMAIN disk controller main. Refers to the microcode for the RAID storage system.
DKP disk processor. Refers to the microprocessors on the back-end director features of the Universal
Storage Platform V.
DKU disk unit. Refers to the cabinet (floor model) or rack-mounted hardware component that contains
data drives and no controller components.
DMP Dynamic Multi Pathing
EC error code
emulation The operation of the RAID storage system to emulate the characteristics of a different storage
system. For device emulation the mainframe host “sees” the logical devices on the RAID storage
system as 3390-x devices. For controller emulation the mainframe host “sees” the control units
(CUs) on the RAID storage system as 2105 or 2107 controllers.
RAID storage system operates the same as the storage system being emulated.
emulation group A set of device emulation types that can be intermixed within a RAID group and treated as a
group.
env. environment
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