1. A method of peer messaging across multiple storage processors (SPs) of a data storage array, the method comprising: using a token, by a first SP of the data storage array, to identify particular data stored at a source storage location on the data storage array; starting, by the first SP, multiple write using token (WUT) operations which use the token in response to multiple WUT requests, each WUT operation moving the particular data from the source storage location to a respective destination storage location; and providing, by the first SP, a single “touch” message in response to starting the multiple WUT operations by the first SP, the single “touch” message informing a set of other SPs of the data storage array that the token which identifies the particular data has been touched.