HP 6400/8400 User Manual page 139

N
near-online On-site storage of data on media that takes slightly longer to access than online storage kept on
storage high-speed disk drives.
Network Storage See NSC.
Controller
node port A device port that can operate on the arbitrated loop topology.
non-OFC (Open A laser transceiver whose lower-intensity output does not require special open fibre channel
Fibre Control) mechanisms for eye protection. The HP Enterprise Storage System transceivers are non-OFC
compatible.
NONCRITICAL An EMU condition that occurs when one or more elements in the drive enclosure fail or are
Condition operating outside specifications. The failure does not affect operation of the enclosure; all devices
in the enclosure continue to operate according to specifications. If there are additional failures,
however, the devices may not operate properly. UNRECOVERABLE and CRITICAL errors take
precedence over this condition. This condition takes precedence over the INFORMATION
condition. Early correction can prevent the loss of data.
NSC Network storage controller. The HSV controllers used by the HP Enterprise Storage System.
NVRAM Nonvolatile Random Access Memory. Memory whose contents are not lost when a system is
turned Off or if there is a power failure. This is achieved through the use of UPS batteries or
implementation technology such as flash memory. NVRAM is commonly used to store important
configuration parameters.
O
occupancy alarm A percentage of the total disk group capacity in blocks. When the number of blocks in the disk
level group that contain user data reaches this level, an event code is generated. The alarm level is
specified by the user.
OCP Operator Control Panel. The element that displays the controller's status using indicators and an
LCD. Information selection and data entry is controlled by the OCP pushbutton.
online storage An allotment of storage space that is available for immediate use, such as a peripheral device
that is turned on and connected to a server.
operator control See OCP.
panel
P
param That portion of the HP HSV controller termination code display that defines:
password A security interlock where the purpose is to allow:
PDM Power distribution module. A thermal circuit breaker-equipped power strip that distributes power
from a PDU to HP Enterprise Storage System elements.
PDU Power distribution unit. The rack device that distributes conditioned AC or DC power within a
rack.
petabyte A unit of storage capacity that is the equivalent of 2
terabytes.
physical disk A disk drive mounted in a drive enclosure that communicates with a controller pair through the
device-side fibre channel loops. A physical disk is hardware with embedded software, as opposed
to a virtual disk, which is constructed by the controllers. Only the controllers can communicate
directly with the physical disks.
The two-character parameter identifier that is a decimal number in the 0 through 31 range.
The eight-character parameter code that is a hexadecimal number.
A management agent to control only certain storage systems
Only certain management agents to control a storage system
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