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microcode. One or more microinstructions used
in a product as an alternative to hard-wired
circuitry to implement functions of a processor or
other system component.
mirrored pair. Two disk drives that contain the
same data, and are referred to as one entity by
the using system.
mirroring. The process of writing the same data
to two disk drives at the same time. The two disk
drives become a mirrored pair. The system can,
therefore, continue to operate correctly when one
of the mirrored disk drives fails.
N
node. In a network, a point at which one or more
functional units connect channels or data circuits.
For example, in an SSA subsystem, a disk drive
or an adapter.
O
object data manager (ODM). In the operating
system, a data manager intended for the storage
of system data.
ODM. Object data manager (ODM)
Offline state. The state that a RAID array enters
when two or more member disk drives become
missing.
P
page split. The separation of amounts of data in
preparation for data transfer. The operating
system splits data on page boundaries, where a
page is 4 KB.
parameter. A variable that is given a constant
value for a specified application.
PCI. Peripheral Component Interconnect.
pdisk. Physical disk.
physical disk. The actual hardware disk drive.
POST. Power-on self-test.
power-on self-test (POST). A series of
diagnostic tests that are run automatically by a
device when the power is switched on.
primary half. The term that distinguishes one
half of a split array. The term “secondary half”
distinguishes the other half of the split array.
R
RAID. Redundant array of independent disks.
RAID array. In RAID systems, a group of disks
that is handled as one large disk by the operating
system.
RAID manager. The software that manages the
logical units of an array system.
Rebuilding state. The state that a RAID array
enters after a missing member disk drive has
been returned to the array or exchanged for a
replacement disk drive. While the array is in this
state, the data and parity are rebuilt on the
returned or replacement disk drive.
Rejected disk. A failing disk drive that the array
management software has removed from a RAID
array.
Reserved status. The disk drive is used by
another using system also.
router. A computer that determines the path of
network traffic flow.
S
SCSI. Small computer system interface.
SDRAM. Synchronous dynamic random-access
memory.
secondary half. The term that distinguishes one
half of a split array. The term “primary half”
distinguishes the other half of the split array.
Serial Storage Architecture. An
industry-standard interface that provides
high-performance fault-tolerant attachment of I/O
storage devices.
Glossary 491
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