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ISSUE:

TSM failed to incremental backup a VM, it ran a full backup instead.

image

CAUSE:

The CBT (Changed Block Tracking) feature is set to off in the VM settings

Run ‘show vm all’ in dsm client console to confirm the settings – changeTracking: Off

SOLUTION:

Connect to VCenter and right click the target VM, then choose Edit Settings > Options > Advanced/General > Configuration Parameters and set ctkEnabled = “TRUE”

* According to IBM, the value should be automatically set by TSM after the first full backup of the VM. But in my case, it did not happen.

REFERENCE:

http://www-304.ibm.com/support/docview.wss?uid=swg21579375

http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1020128

http://kb.vmware.com/selfservice/microsites/search.do?cmd=displayKC&externalId=1031873

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