HP B6960-90078 manual Directory junction Windows specific term, Disk Agent concurrency

Glossary

direct backup A SAN-based backup solution in which data movement directly from disk to tape (or to other secondary storage) is facilitated by the SCSI Extended Copy (Xcopy) command. Direct backup lessens the backup I/O load on systems in a SAN environment. The data movement is facilitated directly from disk to tape (or to other secondary storage) by the SCSI Extended Copy (XCopy) command. The command is provided by any element of the infrastructure including bridges, switches, tape libraries, and disk subsystems. See also XCopy engine.

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.

Directory Store (DS) (MS Exchange specific term)

A part of the Microsoft Exchange Server directory. The Microsoft Exchange Server directory contains objects used by Microsoft Exchange applications in order to find and access services, mailboxes, recipients, public folders, and other addressable objects within the messaging system.

See also Information Store (MDB).

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 concurrency

The number of Disk Agents that are allowed to send data to one 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 post-exec commands are specified once, they are started many times, once per each object.

G-11