Windows System State backup fails if any mounted volume's capacity is greater than 63,000,000,000,000 bytes (57.3 TB)

Problem

Windows System State backup fails if any mounted volume's capacity is greater than 63,000,000,000,000 bytes (57.3 TB), even if this volume is empty, and even if it is NOT selected in the job (it should NOT be selected for backup as per the VSS limitation in Usability limit for Volume Shadow Copy Service (VSS) in Windows

Error Message

Job log:

V-79-10000-11223 The Microsoft Volume Shadow Copy service (VSS) that you selected cannot snap this volume. Select the default snapshot provider, and then run the job again

Backup Exec Debug:

[besc] Error: Disc \\?\volume(volume ID)\ is greater than define threshold of 63TB
[besc] Exit VSSsnapshotvolume::checkforunsupporteddisc () return=[0x8004230c VSS_E_VOLUME_NOT_SUPPORTED]
[besc] Exit VSSsnapshotvolume:: initialize () return=[0x8004230c VSS_E_VOLUME_NOT_SUPPORTED]
 

Cause

Mounted volumes in Windows have capacity greater than the default 63,000,000,000,000 bytes (57.3 TB) in Backup Exec configuration.

Solution

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 machine be made prior to making any registry changes.
 

To resolve this issue, modify a Backup Exec setting in Windows registry key
HKLM\SOFTWARE\Veritas\Backup Exec For Windows\Backup Exec\Engine\Misc\BescLargeDiscBlock on the client to allow the maximum size of a volume to be greater than 63,000,000,000,000 bytes (57.3 TB) (for example, if the largest volume's capacity is 99,000,000,000,000, then the value should be set to 110 decimal or more. The mathematics relates to 1024 bytes per kilobyte. Hence, it is recommended to set a value at least 10% larger than the size of the disk).

This key should exist by default, however If this key does not exist already, it will be necessary to create it.

HKLM\SOFTWARE\Veritas\Backup Exec For Windows\Backup Exec\Engine\Misc\

BescLargeDiscBlock          REG_DWORD
Default Value = 63 decimal / 3f hex
 

Note: It has been observed that the sum total of the size of all volumes needs to be entered rather than the size of the largest single volume on some systems. If the backups continue to fail after entering the value for the largest volume, try changing the value to the number representing the size of all volumes added together.
 

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