directory junction | (Windows specific term) Directory junctions use the reparse |
| point concept of Windows. An NTFS 5 directory junction allows |
| you to redirect a directory/file request to another location. |
disaster recovery | A process to restore a client’s main system disk to a state close |
| to the time when a (full) backup was performed. |
Disk Agent | A component needed on a client to back it up and restore it. |
| The Disk Agent controls reading from and writing to a disk. |
| During a backup session, the Disk Agent reads data from a disk |
| and sends it to the Media Agent, which then moves it to the |
| device. During a restore session the Disk Agent receives data |
| from the Media Agent and writes it to the disk. |
Disk Agent | The number of Disk Agents that are allowed to send data to one |
concurrency | Media Agent concurrently. |
disk discovery | The detection of disks during client backup with disk discovery. |
| During this backup, Data Protector discovers (detects) the disks |
| that are present on the client — even though they might not have |
| been present on the system when the backup was configured |
| — and backs them up. This is particularly useful in dynamic |
| environments, where configurations change rapidly. After the |
| disks are expanded, each inherits all options from its master |
| client object. Even if pre- and |
| once, they are started many times, once per each object. |
disk group | (Veritas Volume Manager specific term) The basic unit of data |
| storage in VxVM system. A disk group can consist of one or |
| more physical volumes. There can be more than one disk group |
| on the system. |
disk image | A |
(rawdisk) backup | bitmap images. A disk image (rawdisk) backup does not track |
| the files and directory structure stored on the disk, but stores a |
| disk image structure on byte level. You can perform a disk image |
| backup of either specific disk sections or a complete disk. |
disk quota | A concept to manage disk space consumption for all or a subset |
| of users on a computer system. This concept is used by several |
| operating system platforms. |
disk staging | The process of backing up data in several phases to improve |
| the performance of backups and restores, reduce costs of storing |
Concepts guide | 359 |