quoted

Forgot to mention: During testing dynamically adding namespaces it was
possible to trigger the WARNINGs in the nvme_parse_ana_log(). Initially
the subsystem started with 8 namespaces and during runtime another 8
namespaces was added.

The controller is required to have a non-zero MNAN value if it supports
ANA:

   If the controller supports Asymmetric Namespace Access Reporting, then
   this field shall be set to a non-zero value that is less than or equal
   to the NN value.

That was my thought exactly

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