HP StorageWorks XP24000/XP20000 Performance Control User Guide (T5214-96087, September 2010)

Glossary
ACP Array control processor.
CU Control unit.
DASD Direct-access storage device.
DFW DASD fast write.
DKA Disk adapter.
See also ACP
DKCMAIN Disk controller main.
ESCON Enterprise systems connection An optical interface used to connect the mainframe
to the control unit; a predecessor to FICON.
LD, LDEV Logical device. An LDEV is created when a RAID group is carved into pieces
according to the selected host emulation mode (that is, OPEN-3, OPEN-8,
OPEN-9). The number of resulting LDEVs depends on the selected emulation
mode. The term LDEV is also known as term volume.
LUN Logical unit number.
NVS Nonvolatile storage.
PDEV Physical device.
P-VOL Primary volume.
SM Shared memory.
SMPL Simplex.
S-VOL Secondary or remote volume. The copy volume that receives the data from the
primary volume.
SVP Service processor. A notebook computer built into the disk array. The SVP
provides a direct interface to the disk array and used only by the HP service
representative.
TCz Hitachi TrueCopy™ for Mainframe.
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