User Manual

Glossary
223Enterprise Virtual Array 3000 User Guide
NONCRITICAL Condition
A disk drive enclosure EMU condition report that occurs when one or more elements inside
the enclosure have failed or are operating outside of their specifications. The failure does not
affect continued normal operation of the enclosure. All devices in the enclosure continue to
operate according to their specifications. The ability of the devices to operate correctly may be
reduced if additional failures occur. UNRECOVERABLE and CRITICAL errors have
precedence over this condition. This condition has precedence over INFORMATION
condition. Early correction can prevent the loss of data.
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 Enterprise Storage System transceivers are non-OFC
compatible.
NSC
Network Storage Controller. The HSV Controllers used by the 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.
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 LEDs and an
LCD. Information selection and data entry is controlled by the OCP pushbuttons.
operator control panel
See OCP.