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Glossary



ACL

Access Control List. A list that contains the users' or groups' access rights to each share.



active file system

A file system excluding its snapshots.



blocking factor

The number of tape blocks that are transferred in each write operation.



CIFS

Common Internet File System. A protocol for networking PCs.



console

A terminal that is attached to a filer's serial port and is used to monitor and manage filer operation.



DNS

Domain Naming Service. An Internet service for finding IP addresses.



dump path

A path that specifies one volume, qtree, or subtree to back up.



file mark

Data on a tape that signals a boundary of a tape file.



HTTP

HyperText Transfer Protocol. An Internet Web transfer protocol.



increment chain

A series of incremental backups of the same path.



inode

A data structure containing information about files on a filer and in a UNIX file system.



local tape device

A program-based functionality associated with a tape drive that is directly attached to a filer that is performing a tape operation.



MD5

Message Digest 5. A checksum algorithm described in RFC (Request For Comments) 1321, a proposal for an Internet standard.



mirror

A volume that contains a read-only copy of data in the active file system of another volume, usually on another filer.



NDMP

Network Data Management Protocol. A protocol that allows Network Appliance filers to communicate with backup applications, and provides capabilities for controlling the robotics of multiple tape backup devices.



NFS

Network File System. A protocol for networking UNIX-based computers.



NIS

Network Information Service, formerly called Yellow Pages. An administrative database for networks.



NVFAIL

Software that warns you of compromised database validity and automatically renames the database so that it does not restart automatically.



NVRAM

Nonvolatile RAM in the filer, used for logging incoming write data and NFS requests. Improves system performance and prevents loss of data in case of a filer or power failure.



Open Systems platform

A non-filer system, such as a server running Solaris, HP-UX, Windows NT, or Windows 2000, whose data can be backed up to a SnapVault secondary storage system.



Open Systems SnapVault agent

A software module that can be installed on a non-filer system and enables that system to back up its data to a SnapVault secondary storage system.



plex

A physical copy of a file system. An unmirrored volume has one plex; a mirrored volume has two identical plexes.



primary storage system

A system whose data is to be backed up by SnapVault.



quota

A limit placed on a file system that restricts disk space usage by files with a given UID or GID.



qtree

A special subdirectory of the root of a volume that acts as a virtual subvolume with special attributes.



RAID

Redundant Array of Independent Disks. A technique that protects against disk failure by computing parity information based on the contents of all the disks in the array. NetApp filers use RAID Level 4, which stores all parity information on a single disk.



Remote Shell

A program that enables a user on one system to execute a program on another system. Remote Shell connections are usually not interactive.



remote tape device

A program-based functionality associated with a tape drive that is not directly attached to a filer that is performing a tape operation.



root volume

The volume that contains information that controls the entire filer, usually in the /etc/rc file.



secondary storage system

A filer or NearStore system to which data is backed up by SnapVault.



share

A directory or directory structure on the filer that has been made available to network users and can be mapped to a drive letter on a CIFS client.



SnapMirror

Software that performs automated file system replication of a volume onto the same or a separate disk or filer.



SnapRestore

Software that restores an entire volume to the state recorded in a previously taken snapshot.



snapshot

An online, read-only copy of the entire file system that protects against accidental deletions or modifications of files without duplicating file contents. Snapshots enable users to restore files and enable administrators to back up the filer to tape while the filer is in use.



snapshot reserve

The portion of a volume's disk space that is reserved for snapshots.



source filer

The filer from which you are replicating data.



subtree

A directory in a volume or qtree.



tape block

1,024 bytes of data.



tape device

A specific functionality of a physical tape drive that you create by specifying information in the tape device name when you install a tape drive or tape stacker.



tape file

Data on a tape delimited by file marks.



tape library

Hardware that can access tape cartridges randomly.



tape medium changer

Hardware that can load and unload tape cartridges.



tape stacker

Hardware that can access tape cartridges from a stack.



vfiler

A virtual filer created using the MultiStoreTM software that allows you to partition the storage and networking resources of a single filer so that it appears as multiple filers on the network.



volume

A file system.



volume copy

A way of copying both data in the active file system and data in snapshots from one volume to another.

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