N
near-online
storage
On-site storage of data on media that takes slightly longer to access than online storage kept on
high-speed disk drives.
Network Storage
Controller
See NSC.
node port A device port that can operate on the arbitrated loop topology.
non-OFC (Open
Fibre Control)
A laser transceiver whose lower-intensity output does not require special open fibre channel
mechanisms for eye protection. The HP Enterprise Storage System transceivers are non-OFC
compatible.
NONCRITICAL
Condition
An EMU condition that occurs when one or more elements in the drive enclosure fail or are
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
level
A percentage of the total disk group capacity in blocks. When the number of blocks in the disk
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
panel
See OCP.
P
param That portion of the HP HSV controller termination code display that defines:
• 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.
password A security interlock where the purpose is to allow:
• A management agent to control only certain storage systems
• Only certain management agents to control a storage system
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
50
, 1,125,899,906,842,624 bytes or 1,024
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.
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