Exposed state. The state that a RAID array
enters if a member disk drive becomes missing
(logically or physically) from that array.
F
Failed status. The disk drive is not working.
fencing. SSAdisk fencing is a facility that is
provided in the SSAsubsystem. It allows multiple
using systems to control access to a common set
of disk drives.
flag. Acharacter that shows that a particular
condition exists.
FRU. Field-replaceable unit.
G
GB. Gigabyte.
gigabyte (GB). 1000000000 bytes.
Good state. The state of a RAID array when all
its member disk drives are present.
H
hdisk. Alogical unit that can consist of one or
more physical disk drives (pdisks).An hdisk in an
SSAsubsystem might, therefore, consist or one
pdisk or several pdisks.An hdisk is also known as
a LUN.
hot spare disk drive. Aspare disk drive that is
automatically added to a RAID array to logically
replace a member disk drive that has failed.
hot spare pool. Aconfigured group of disk
drives that contains pdisks and a hot spare disk
drive. The pool ensures that a hot spare disk drive
is available if any pdisk in the group fails.
hot sparing. The process by which a spare disk
drive is automatically added to a RAID array to
logically replace a member disk drive that has
failed.
I
interface. Hardware, software, or both, that links
systems, programs, or devices.
IOCC. Input/output channel controller.
IPN. Independent Packet Network.
ISAL. Independent Network StorageAccess
Language.
K
KB. Kilobyte.
kernel. The part of the operating system that
contains functions that are needed frequently.
kernel mode. In the operating system, the state
in which a process runs in kernel mode. Contrast
with user mode.
kilobyte (KB). 1000 bytes.
L
LBA. Logical block address.
logical disk. An hdisk. See hdisk.
LUN. Logical unit. See also hdisk.
M
maintenance analysis procedure (MAP). A
service procedure for isolating a problem.
MAP. Seemaintenance analysis procedure.
MB. Megabyte.
megabyte (MB). 1000000 bytes.
member disk. Adisk drive that is part of a RAID
array.
metadata. Data that describes data objects.
490 User’s Guide and Maintenance Information
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