Hi Robert,

As long as you triple-check permissions on the cache tier (should be the
same as your actual storage pool) you should be fine.

In our setup I applied this a few times. The first time I made the
assumption permissions would be inherited or not applicable but IOPs get
redirected towards the tier and therefore permissions should be sane. It
stopped all IOPs until I removed the overlay again. But alas; some VMs
died already.

Later on I extra checked the permissions and all was well.

K.

On 16-09-2019 13:12, Eikermann, Robert wrote:
> That would be the case for me. I think all data during one day would fit into 
> the cache, and we could slowly flush back over night (or even over the 
> weekend). But my impression is, I would have to test it. So my initial 
> question: Do I have to stop all VMs before activating the cache? And restart 
> one by one with the cache enabled?
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