The following terms are used for Data ONTAP features:
- 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 Snapshot copies.
- aggregate
- A manageable unit of RAID-protected storage, consisting of one or two
plexes, that can contain one traditional volume or multiple FlexVol volumes.
- 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 storage system’s serial port and is used to monitor and manage storage system 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 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.
- 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 storage system.
- NDMP
- Network Data Management Protocol. A protocol that allows storage systems
running Data ONTAP 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 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 agent
- A software module that can be installed on a 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
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
the array. Storage systems running Data ONTAP software 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 storage system that is performing a tape operation.
- 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 on the storage system 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 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 the entire file system that protects against accidental
deletions or modifications of files without duplicating file contents. Snapshot
copies enable users to restore files and enable administrators to back up the
system to tape while it 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 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.
- 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.
