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03/02/14 Enterprise Support - Symantec Corp. - How to get Advanced Open File Option to snap one volume at a time during multi-volume backups

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How to get Advanced Open File Option to snap one

volume at a time during multi-volume backups

Article:TECH29418 | Created:

2003-01-02| Updated:

2011-11-14

| Article URL

http://www.symantec.com/docs/TECH29418

(http://www.symantec.com/docs/TECH29418)

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How to get Advanced Open File Option to snap one volume at a time

during multi-volume backups

Solution

Performing Advanced Open File Option (AOFO) backups of multiple

volumes on a single server using the default settings may cause one

or more of the following errors:

Final error code: a00084af HEX Final error description: Directory or

File was not found, or could not be accessed.

OFO: Snapshot error (0xa000851c): VSP SnapShot

CacheFileBroker was unable to allocate cache files. Check disk

space.

OFO: Unable to get minimum quiet time window for physical volume.

OFO: Backup Exec failed to establish communication with the

Advanced Open File Option component. A reinstallation of the

Advanced Open File Option is probably necessary.

The Advanced Open File Option creates a snapshot of each volume

being backed up, in order to maintain a point-in-time consistent

backup. When changes are made to the volume, the pre-change

version of the data is saved to the cache file and the new data iswritten to the volume. When it is time to back up that data, the pre-

change data in the cache file is backed up. By default, when backing

up multiple volumes on a server in a single job, AOFO creates a

cache file for all volumes simultaneously. The benefit to this is that all

volumes on that server are point-in-time consistent in the backup.

There are several environmental factors that occasionally make this

scenario undesirable.

In Backup Exec (tm) 9.1 a new feature that allows the user to

disable the multi-volume snap was introduced. This allowed AOFO to

create the snapshot and the corresponding cache file one at a time,


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thus limiting the environmental impact of using AOFO.

To enable Single Volume Cache, perform the following:

Note:This is a global setting that affects all jobs run from this

media server.

1. Open Regedt32from Start | Run

Warning: Incorrect use of the Windows registry editor may prevent

the operating system from functioning properly. Great care should

be taken when making changes to a Windows registry. Registry

modifications should only be carried-out by persons experienced in

the use of the registry editor application. It is recommended that a

complete backup of the registry and workstation be made prior tomaking any registry changes.

2. Browse to

HKEY_LOCAL_MACHINE\SOFTWARE\VERITAS\Backup

Exec\Engine\Backup for Backup Exec 10.x and below (Figure 1)

or

HKEY_LOCAL_MACHINE\SOFTWARE\Symantec\Backup Exec

For Windows\Backup Exec\Engine\Backup for Backup Exec 11d

and above

Figure 1


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3. Double-click DoSingleVolumeSnap and change the Value to 1

(Figure 2)

Figure 2

4. Close the registry editor

In Backup Exec 10.0 and above, the same can also be done onper job basis.


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1. Click the Backup button to create a new job

2. In the backup job properties, under Settings, select Advanced

Open File

3. Select the check box Use Advanced Open File Option

4.To enable single volume cache, select the option Process Logical

Volumes for backup one at a time(Figure 3)

Figure 3

Supplemental Materials

Value V-79-10000-11231

Description

Try selecting the option 'Process logical volumes for backup, one at a

time' , and then run the job again


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Value 72956

Description

DoSingleVolumeSnap registry key for enabling single volume snap

Related Articles

TECH89771 Backup jobs fails or completes with exceptions

with the error: "Unable to get minimum quiet time window for

physical volume" and / or "The semaphore timeout period hasexpired" when Advanced Open File Option is used. (index?

page=content&id=TECH89771)

TECH32393 Advanced Open File Option backups fail because

of an I/O device error. (index?page=content&id=TECH32393)

TECH63344 Backup job with AOFO enabled fails with error

e0009413 - An error occurred during the snapshot cleanup, orcould not locate a snapped volume from which to backup (index?

page=content&id=TECH63344)

Legacy ID

264464

Article URL http://www.symantec.com/docs/TECH29418

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