Resetting CBT without a power-off

As per this article http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=2090639

I need to reset change block tracking in order to deal with this bug.

Some articles like this:

http://www.veeam.com/kb1113

describe the process in terms of powering off the VM.  Others like this:

http://www.veeam.com/kb1940

describe it in terms of just running a powercli script, but without saying whether the VM should be powered off during the process.

Does resetting CBT:

1. require a power off?

2. not require a power off, but one is recommended?

3. Doesn't matter if it is powered off or not?

Thanks!