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G-10
Glossary
delta backup
A delta backup is a backup containing
all the changes made to the database
from the last backup of any type.
See also backup types
device
A physical unit which contains either
just a drive or a more complex unit such
as a library.
device chain
A device chain consists of several
standalone devices configured for
sequential use. When a medium in one
device gets full, the backup
automatically continues on a medium in
the next device in the device chain.
device group (EMC Symmetrix specific
term)
A logical unit representing several EMC
Symmetrix devices. A device cannot
belong to more than a single device
group. All devices in a device group
must be on the same EMC Symmetrix
unit. You can use a device group to
identify and work with a subset of the
available EMC Symmetrix devices.
device streaming
A device is streaming if it can feed
enough data to the medium to keep it
moving forward continuously.
Otherwise, the tape has to be stopped,
the device waits for more data, reverses
the tape a little and resumes to write to
the tape, and so on. In other words, if the
data rate written to the tape is less or
equal the data rate which can be
delivered to the device by the computer
system, then the device is streaming.
Streaming significantly improves the
performance of the device and use of
space.
DHCP server
A system running the Dynamic Host
Configuration Protocol (DHCP)
providing dynamic configuration of IP
addresses and related information. Data
Protector can back up DHCP server data
as part of the Windows configuration.
differential backup
An incremental backup (incr) based on
any previous Data Protector backup (full
or any incremental), which must still be
protected.
See incremental backup.
differential backup (MS SQL specific
term)
A database backup that records only the
data changes made to the database after
the last full database backup.
See also backup types.
differential database backup
A differential database backup records
only those data changes made to the
database after the last full database
backup.