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EMC Symmetrix DMX-3 Product Guide
Glossary
global memory Random-access electronic system storage used to retain frequently
used data for faster access by the channel.
group The physical disks related to each other for common parity protection
when implementing the RAID 5 option.
H
HACMP High Availability Clustered Multiprocessing. IBM’s cluster system
developed by CLAM Associates.
head and disk
assembly (HDA)
A field replaceable unit in the Symmetrix subsystem containing the
disk and actuator.
home address (HA) The first field on a CKD track that identifies the track and defines its
operational status. The home address is written after the index point
on each track.
hypervolume
extension
The ability to define more than one logical volume on a single
physical disk drive making use of its full formatted capacity. These
logical volumes are user-selectable in size. The minimum volume size
is one cylinder and the maximum size depends on the disk drive
capacity and the emulation mode selected.
I
ICKDSF See “device support facilities program (ICKDSF)”.
identifier (ID) A sequence of bits or characters that identifies a program, device,
controller, or system.
IML Initial Microcode Program Loading.
IMPL Initial Microcode Program Loading.
index marker An indicator for the physical beginning and end of a track.
index point The reference point on a disk surface that determines the start of a
track.
IOCP Input/Output Configuration Program.
initiator A SCSI device (usually a host system) that requests an operation to be
performed by another SCSI device.
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