I just upgraded from Luminous to Nautilus. the cluster was originally hammer or 
kraken (can't recall), then jewel, on to luminous, and now Nautilus. The 
message i get from ceph -s is:
"health: HEALTH_WARN
crush map has legacy tunables (require firefly, min is hammer)"
Not sure how to get rid of it. I tried "ceph osd set-require-min-compat-client 
firefly" per instructions but still have error. When I query osd:
ceph osd dump | grep min_compat_client
require_min_compat_client firefly
min_compat_client firefly
Instructions say I can ignore the error, but that seems like a bad idea.
Windows VM's are running on qemu/kvm via rbd connection.
Ceph and KVM are running CentOS7. Just upgraded all clients to 
"centos-release-7-8.2003.0.el7.centos.x86_64"
I have rebooted all nodes since CentOS upgrade and again after Nautilus upgrade.

tried setting "ceph osd set-require-min-compat-client jewel" but then 
heath_warn was still present and:
ceph osd dump | grep min_compat_client
require_min_compat_client jewel
min_compat_client firefly

Any help is appreciated.
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