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Check your Heartbeat Datastores

Angelo Luciani
Angelo Luciani

As I was working through my VCAP5-DCA studies, I was at the point where I had to mask a LUN. I typically don’t perform this function on my hosts in my enterprise environment, but rather, let my storage admins look after those details.

But I am working on my home lab and this is a requirement for the DCA exam, so I was all in. I was at the point where I had to reclaim the device and the following error appeared.

LUN Mask

I was puzzled at first thinking that nothing is actually using this device in my home lab – but it turns out I was wrong. I gave it some thought and since I had HA running, is it possible that this device is being used as a heartbeat datastore.

The answer was YES

Heartbeat Datastore

I removed the datastore-LUNMASK as one of the heartbeat datastores, ran through my procedure and it work! I hope this helps other folks that may run into this situation.

Let me know on Twitter if you ever ran into this situation and if how you solved it.


Angelo Luciani

Blogger who enjoys exploring current and emerging technologies.