I am not sure what the latest position on this is. I am sure Java will come in and lay down the law. I know that Tac has changed their mind a few times over the years. The last time I checked was about 3-4 years ago and the answer was that it was not supported. That being said, we did it anyway as part of our standard operating procedure. We were running on 4.1 at the time and upgrades were a major annoyance. The basic rule of thumb is that you don't pull the drive while the system is live (unless the drive is already in a fault condition). You also don't fully insert the new drive until the system boots up.
Now, all that being said -- I have not tested this procedure on the appliance model. I would assume that if you follow IBM/HP best practices then you would be OK but I don't know Tac's official word on this.
Last time I checked with the BU (about 2 months ago) we were going to stick to this policy:
Removing Hard Drives
Cisco only supports replacing failed hard drives. Cisco does not support drive pulling/swapping as a method of fast upgrade reversion, restore, or server recovery. For information on replacing a failed hard drive, refer to the Troubleshooting Guide for Cisco Unified Communications Manager.
It's worth noticing that this applies not only to CUCM, but also to CUPS and CUC since the foundation for them comes from CUCM. So the same rule applies for them even if not noted on the RN of the products.
If at some point in time the BU decides it will be supported there will be a document stating so, otherwise if it's not in a document as supported, it's a not supported config.
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