Migrating VM from one to other datastore but it give A Failed to start SvMotion Error during disk setup. general system error Failed to start disk migration. This error we are getting when the migration is completing till 90% but later it throws A Failed to start SvMotion Error during disk setup. general system error occurred: Failed to start disk migration error.
Please check whether the VM which trying to migrate to another datastore has multiple disks from multiple datastore because normally this issue occurs when the VM has multiple disk from different datastores.
so the resolve this issue migrate each VM disk to the new datastore one by one and keep all assigned disks from single datastore only to avoid this error in future.
Please make sure that all the compatibility checks are successful.