Container:
nohup pct migrate 1076 srv78 --target-storage LVMStore &
Untested (VM):
qm migrate 1076 srv78 -migration_network 10.0.0.0/24 -targetstorage SrvSSD -with-local-disks
Does not want to move?
You need to add the shared=1 option on this line. This way the container can be migrated whereby the local mountpoint will be ignored during migration. You need to make sure that the local mount point is available on every node yourself (e.g. with gfs2).
mp0: /pvestorage/ceph/_custom/tftp/srv_tftp,mp=/srv/tftp,shared=1