NVFAILSoftware that warns you of compromised database validity and automatically renames the database so that it does not restart automatically.
NVRAMNonvolatile Random Access Memory. Type of computer memory that retains data in the event of a loss of power.
NVRAM mirrorA synchronously updated copy of the contents of a clustered filer's NVRAM stored on the partner filer.
NVS (Non-Volatile Storage)random access memory storage whose contents are not lost when power is removed.
O.C.E. (Online Capacity Expansion)A process for adding storage capacity to an existing RAID array without having to take the server offline.
off-line data replication.Data replication by storing data off-line, usually a backup tape or disk stored in a safe location; this method is best for applications that can accept a…
OFWOpen Firmware. The firmware or system startup code used in some NetApp appliances.
on-demand streamA previously recorded media stream that users can request at a time most convenient to them. Users can rewind and fast-forward on-demand media streams.
on-line data replicationData replication by copying to another location that is immediately accessible.
ONTAPOpen Network Technology for Appliance Products. Generally referred to as Data ONTAP.
open firmware (OFW)The firmware or system startup code used in some NetApp appliances. Like the widely known BIOS, OFW is used to bring the hardware out of reset and perform…
Open Systems Interconnect (OSI)(OSI)a seven-layer hierarchical reference interface and communications model sponsored by ISO, 1984, known as the OSI Reference Model: layer 7--applications…
Optimized Disk UtilizationAllows the full available capacity to be used on all drives attached to a controller, even if the drive sizes are different.
Pack slipA lateral slip of selected tape windings causing high or low spots (when viewed with tape reel laying flat on one side) in an otherwise smooth tape pack.
package alertTime at which a message is sent indicating a problem with a package.
package eventA package condition such as a failure that causes a notification message to be sent. Package events can be accompanied by alerts, but not alarms.
package recovery groupA set of one or more packages with a mapping between their instances on the cluster and their instances on the Recovery Cluster.
Packet Protocol/Packetized SCSIThis Ultra320 SCSI feature speeds the transfer of data, command, and status packets over earlier generations of SCSI.
packet traceA facility for tracing network traffic that is directed to a filer. See also "network trace."
panic(PA-nik) Sudden extreme anxiety or fear that may cause irrational thoughts or actions.
Parallel TechnologyAn interface that allows a hard drive to receive multiple bits of information at the same time through short, wide cables carrying multiple signals.
ParityA form of data protection used by RAID level 5 to recreate the data of a failed drive in a disk array.
parity checkingA method of data verification. Parity information is used to reconstruct data.
parity diskDisk on which parity information is stored for a RAID group.
PartitionA partition is an individual section of computer storage media such as a hard drive.
partnerA member of a clustered pair. From the point of view of the local filer, the other filer in the cluster is the partner. See also "takeover partner."
partner modeThe method used to communicate through the command-line interface with the failed filer in a cluster during a takeover.
PAV (Parallel Access Volume)an IBM feature that allows multiple applications to access the same data at the same time.
PCB carrierPrinted Circuit Board carrier. The unit that slides out from the chassis of a NetApp appliance and might contain (depending on the PCB carrier) expansion…
PCIPeripheral Component Interface (Interconnect). A high-speed interconnect local bus used to support multimedia devices.
permissionsAuthorization to perform operations associated with a shared resource, such as a file, directory, or printer.
persistent connectionA connection between two networked devices that remains opened after the initial request is complete, to handle additional requests.
PETA NPC controlled by a player such as a Wolf, Infernal, and so on.
PetabyteA measure of data size. One petabyte is equivalent to 1,000 terabytes.
physical data replicationAn on-line data replication method that duplicates I/O writes to another disk on a physical block basis.
planned downtimeAn anticipated period of time when nodes are taken down for hardware maintenance, software maintenance (OS and application), backup, reorganization…
Point of Presence (POP)A remote location that provides network connectivity back to the core of the network for users within its service area.
Point-to-PointDirect connection between the backplane and the storage device, allowing for the high-performance, full utilization of bandwidth.
polymer(PAH-lih-mer) A molecule made up of small identical molecules called monomers. The monomers are joined together in a repeating pattern.
POPContraction of "Repopulation", often used as a shortened term for the re-spawn of monsters.
Popped strandA strand of tape protruding from the edge of a wound tape pack. Print through: The condition where low frequency signals on one tape winding imprint…
PortAn implanted device through which blood may be withdrawn and drugs may be infused without repeated needle sticks. Also called port-a-cath.
PowerPathA host-based software product from Symmetrix that delivers intelligent I/O path management.
prefetchThe process of retrieving and caching data before it is requested by the client.
primary packageThe package that normally runs on the cluster in a production environment.
PrivilegesA clinician's right to practice his or her profession, such as medicine or surgery, at a particular hospital or health care facility.
proxy modeThe default mode of operation for NetCache in which the cache serves all users who set up their browsers to use NetCache as their proxy.
proxy serverA server that receives requests intended for another server and that acts on the client's behalf (as the client's proxy) to obtain the requested service.
PSUPower supply unit. The replaceable device that supplies power to a NetApp appliance.
pushbutton failoverUse of the cmrecovercl command to allow all package recovery groups to start up on the Recovery Cluster following a significant cluster event on the…
PV linksA method of LVM configuration that allows you to provide redundant disk interfaces and buses to disk arrays, thereby protecting against single points of…
PVCPermanent virtual circuit. A network connection with a static route defined in advance, usually by manual setup.
PVOL (Primary Volume)A primary volume configured in an XP series disk array that uses Continuous Access.
QAS (Quick Arbitration Select)An Ultra320 SCSI feature that improves the control release between SCSI devices, reducing command overhead.
QOSQuality of Service. The performance level defined for a data communications system.
qtreeA special subdirectory in a volume that acts as a virtual subvolume with special attributes, primarily quotas and permissions.
QuantizationA process in which a continuous signal is converted to a series of points at discrete levels.
quorumThe number of Senators that must be present for the Senate to do business. The Constitution requires a majority of Senators (51) for a quorum.
quorum serverA cluster node that acts as a tie-breaker in a disaster tolerant architecture in case all of the nodes in a data center go down at the same time.
quotaA way to specify limits to the amount of storage or number of users a Web site can use.
R1The first-generation offspring of a recombinant (genetically modified) organism. Not standard terminology. See: T0, T1, and T2.
R2The Symmetrix term indicating the remote data copy that is the secondary copy. It is normally read-only by the nodes at the remote site.
RADIUSHorizontal distance from the center of rotation.
RAIDA raid is a large-scale attack on an area by a group of players.
RAID (Redundant Array of Independent Disk)Redundant Array of Inexpensive Disks. A technology in which data is stored in distributed fashion across multiple disk drives to achieve redundancy and…
RAID (Redundant Array of Independent Disks)A method of accessing multiple individual disks as if the array were one larger disk, spreading data access out over these multiple disks.
RAID 0 (striped disks without parity)Block striping across multiple drives is provided, yielding higher performance than is possible with individual drives.
RAID 1 (mirrored disks without parity)Provides data protection by duplicating all data from a primary drive on a secondary drive. Drives are paired and mirrored.
RAID disk scrubbingThe process by which the system reads each disk in the RAID group and tries to fix media errors by rewriting the data to another disk area.
RAID groupA set of data disks and a parity disk that implement RAID 4.
RAID Level MigrationA process to change the RAID level of an existing RAID array without taking the server offline. Also known as Morphing.
RAID LevelsRAID levels refer to different array architectures that offer various advantages in terms of data availability, cost, and performance.
RAID Management SoftwareSoftware that makes installation, configuration, and management of RAID arrays easy.
Real-time Transport Control Protocol (RTCP)A feedback protocol that provides QoS information to the streaming server. The RTCP feedback mechanism periodically describes the state of the network so…