Disable Multi-Attach for an Amazon EBS volume
You can disable Multi-Attach for an io2 volume only if it is attached to no more than
one instance.
You can't disable Multi-Attach for io1 volumes after creation.
You can disable Multi-Attach for an io2 volume only if it is attached to no more than
one instance.
You can't disable Multi-Attach for io1 volumes after creation.