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Using Backup Options
Chapter 5 249
Device Backup Options
You can select the options listed below for each backup device in use.
None of the settings are needed, because CRC Check, Concurrency, and
Media Pool use the default values that are set when the device is
configured. The Prealloc List value is specified along with the media
pool settings.
CRC Check
Set this option to have Data Protector calculate the CRC (Cyclic
Redundancy Check) when a backup runs. CRC is an enhanced checksum
function that lets you later confirm using the Verify option whether or
not data has been written correctly to the medium.
The default value is OFF.
Concurrency
Concurrency allows more than one Disk Agent to write to one backup
device. Data Protector can then keep the devices streaming if data can be
accepted faster than a Disk Agent can send it. The maximum
concurrency value is 32.
Data Protector provides default values for all supported devices.
Media Pool
This option selects the media pool with the media you will use for a
backup. If not defined, a default pool, which is a part of device
specification, is used.
Prealloc List
The Prealloc List is a subset of media in the media pool used for a
backup. It specifies the order in which the media will be used. When
using the Prealloc List and the Strict media allocation policy with the
backup device, Data Protector expects the sequence of the media in the
device to correspond with that specified in the Prealloc List. If the
media are not available in this sequence, Data Protector issues a mount
request. If no media are specified in this list, then the Data Protector
allocation procedure is used to allocate media.