there was a similar issue reported - https://access.redhat.com/solutions/6768211

however customer does have different storage so they are using - https://docs.netapp.com/us-en/trident/trident-use/ontap-nas.html which does not support block volume mode

the situation gets a little bit better when overhead is raised from 0.055 to 0.09 however only 40% of warm migrations are successful

cold migration is working fine