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Glossary

The following terms are used for Data ONTAP features:

Access control list (ACL)
A list that contains the users' or groups' access rights to each share.
active file system
A file system in use, excluding its Snapshot copies.
aggregate
A grouping of physical storage resources (disks or array LUNs) that provides storage to volumes associated with the aggregate. Aggregates provide the ability to control the RAID configuration for all associated volumes.
blocking factor
In a tape backup operation, the number of tape blocks that are transferred in each write operation.
CIFS
See Common Internet File System (CIFS).
Common Internet File System (CIFS)
Microsoft's file-sharing networking protocol that evolved from SMB.
console
The physical or virtual terminal that is used to monitor and control a storage system.
DNS
See Domain Name System (DNS).
Domain Name System (DNS)
An Internet service for finding computers on an IP network.
dump path
The entity that specifies one volume, qtree, or subtree to back up.
file mark
The data on a tape that signals the boundaries of a tape file.
HTTP
Hypertext Transfer Protocol.
increment chain
A series of incremental backups of the same path.
inode
A data structure containing information about files on a storage system and in a UNIX file system.
local tape device
A program-based functionality associated with a tape drive that is directly attached to a storage system that is performing a tape operation.
Message Digest 5 (MD5)
An algorithm for checksum generation for use in security applications.
mirror
Mirror protection is the periodic exact mirroring of all volume data (both active and protected) from a NetApp source storage system to a NetApp destination storage system. If data in the source storage system is lost or made unavailable (for example if the source system is damaged), then that same data can quickly be made available from the destination mirror site. Mirror operations are employed from primary to secondary storage and from secondary to tertiary storage, in circumstances where secure mirroring of that data, and in event of breakdown at the source site, quick availability of that data from a second site might be required. Mirror protection is based on NetApp Volume SnapMirror technology.
NDMP
Network Data Management Protocol. A protocol that allows storage systems to communicate with backup applications and provides capabilities for controlling the robotics of multiple tape backup devices.
NFS
Network File System.
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 random-access memory.
NVRAM cache
Nonvolatile RAM in a storage system, used for logging incoming write data and NFS requests. Improves system performance and prevents loss of data in case of a storage system or power failure.
Open Systems platform
A system, such as a server running Solaris, HP-UX, or Windows, whose data can be backed up to a SnapVault secondary storage system.
Open Systems SnapVault
The software application that provides a disk-to-disk data protection solution that takes advantage of the NetApp SnapVault technology to protect data.
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 User ID (UID) or group ID (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 a storage array. Storage systems use either RAID4, which stores all parity information on a single disk, or RAID-DP, which stores all parity information on two disks.
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.
root volume
The volume that contains information that controls the entire storage system, usually in the /etc/rc file.
secondary storage system
A storage system to which data is backed up by SnapVault.
share
A directory or directory structure that has been made available to network users and can be mapped to a drive letter on a CIFS client. Also known as a CIFS share.
SnapMirror
A product that performs automated file system replication of a volume onto a separate disk or storage system.
SnapRestore
Software that restores an entire volume to the state recorded in a previously taken Snapshot copy.
Snapshot copy
An online, read-only copy of an entire file system that protects against accidental deletions or modifications of files without duplicating file contents. Snapshot copies enable users to restore files and to back up the storage system to tape while the storage system is in use.
Snapshot reserve
The portion of a volume’s disk space that is reserved for Snapshot copies.
source storage system
The storage system 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 stacker
Hardware that can access tape cartridges from a stack.
volume
A file system.
volume copy

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