HP StorageWorks XP48 - Disk Array, Owner'S Manual

Page: 109 / 124

109
DCR dynamic cache residency (also called Cache LUN XP)
DE Data Exchange software
DFDSS Data Facility Dataset Services
DFSMS Data Facility System Managed Storage
DFW DASD fast write
Disruptive Status that there is no I/O from the host (off-line).
DKA (DisK Adapter) Provides the control functions for data transfer between drives and cache.
The DKA contains DRR (Data Recover and Reconstruct), a parity generator
circuit. It supports four SCSI buses and offers 64 KB of buffer for each SCSI
bus. The DKA also has an internal processor.
DMA0 Controls the data transfer between the ADP and cache.
DMA1 Controls data transfer between the buffers in the DKA and cache.
DMA2 Controls data transfer between the buffers in the DKA and drives.
DMP (Disk Master
Program) A RAID control layer that provides cache control, logical-to-physical
address translation, and RAID control functions. DMP is located in the DKA.
DMP is recognized by the logical volume number and logical blocked
number.
dr drive
DRIVE Represents a SCSI drive whose internal data format is FBA (fixed length).
DSF Device Support Facilities
DSP (Disk Slave
Program) A SCSI drive control layer that provides SCSI control, drive data transfer
control, and parity control functions. It is located in the DKA. DSP is
recognized by the physical volume number and LBA number.
DW duplex write
DWL duplex write line
ECKD Extended Count Key Data
EOF end of field