Enabling more services does seem to trigger the issue still, it is reduced considerably but still can cause issues deploying (running sunbeam configure for example may fail when certain db's are offline - glance, keystone for example).

NAME                             READY   STATUS    RESTARTS        AGE
modeloperator-7bcf6c9fc6-6kjg2   1/1     Running   0               83m
certificate-authority-0          1/1     Running   0               81m
horizon-mysql-router-0           2/2     Running   0               81m
cinder-ceph-mysql-router-0       2/2     Running   0               81m
rabbitmq-0                       2/2     Running   0               81m
keystone-mysql-router-0          2/2     Running   0               81m
glance-mysql-router-0            2/2     Running   0               80m
cinder-ceph-0                    2/2     Running   0               81m
cinder-mysql-router-0            2/2     Running   0               80m
placement-mysql-router-0         2/2     Running   0               80m
nova-api-mysql-router-0          2/2     Running   0               80m
nova-mysql-router-0              2/2     Running   0               80m
nova-cell-mysql-router-0         2/2     Running   0               79m
ovn-relay-0                      2/2     Running   0               80m
placement-0                      2/2     Running   0               80m
cinder-0                         3/3     Running   0               80m
glance-0                         2/2     Running   0               80m
neutron-0                        2/2     Running   0               79m
ovn-central-0                    4/4     Running   0               79m
traefik-0                        2/2     Running   0               81m
traefik-public-0                 2/2     Running   0               81m
keystone-0                       2/2     Running   0               81m
horizon-0                        2/2     Running   0               81m
nova-0                           4/4     Running   0               79m
vault-0                          2/2     Running   0               52m
barbican-mysql-router-0          2/2     Running   0               50m
barbican-0                       3/3     Running   0               50m
heat-mysql-router-0              2/2     Running   0               46m
heat-0                           4/4     Running   0               46m
magnum-mysql-router-0            2/2     Running   0               43m
neutron-mysql-router-0           2/2     Running   1 (42m ago)     79m
magnum-0                         3/3     Running   0               42m
designate-mysql-router-0         2/2     Running   0               36m
bind-0                           2/2     Running   0               36m
designate-0                      2/2     Running   0               36m
octavia-mysql-router-0           2/2     Running   0               31m
octavia-0                        4/4     Running   0               31m
heat-mysql-0                     2/2     Running   2 (18m ago)     46m
glance-mysql-0                   2/2     Running   2 (18m ago)     79m
octavia-mysql-0                  2/2     Running   1 (10m ago)     31m
cinder-mysql-0                   2/2     Running   4 (10m ago)     79m
designate-mysql-0                2/2     Running   2 (8m45s ago)   36m
nova-mysql-0                     2/2     Running   6 (4m45s ago)   79m
horizon-mysql-0                  2/2     Running   6 (4m45s ago)   79m
barbican-mysql-0                 2/2     Running   3 (4m45s ago)   50m
placement-mysql-0                2/2     Running   4 (4m40s ago)   79m
neutron-mysql-0                  2/2     Running   2 (46s ago)     79m
keystone-mysql-0                 2/2     Running   2 (46s ago)     79m
magnum-mysql-0                   2/2     Running   4 (46s ago)     43m
verranm@mz640:~/cloud-in-a-box/scripts$ 

I suspect at this point it will be slow response of my system (I can look at a rebuild later to a different md-based disk layout), but initially thats where the suggestions in https://bugs.launchpad.net/snap-openstack/+bug/2051692 come into play to reduce disk resource contention.