Maintaining mirror and storage system copies of volumes at multiple remote sites

A method, comprising:

• maintaining, by a first server, a mirror copy relationship in a computer readable storage medium between a first storage system at a first site and a second storage system at a second site to mirror data at the first storage system to the second storage system, wherein the first and second sites connect over a network;
• performing, by the first server, a first point-in-time copy operation from the first storage system to a first storage system copy, wherein the data for the first storage system copy is consistent as of the determined point-in-time, wherein the point-in-time copy operation is completed upon creating a data structure indicating data for the first storage system copy as located at the first storage system or the first storage system copy;
• determining, by the first server, a timestamp, wherein the first storage system copy is consistent as of the determined timestamp;
• transmitting, by the first server, a command to a second server to create a point-in-time copy of the second storage system that indicates the determined timestamp;
• processing, by the second server, mirror data transferred from the first server as part of the mirror copy relationship to determine whether a timestamp associated with the mirror data applied to the second storage system is equal to the timestamp indicated in the command in response to the command;
• and
• performing, by the second server, a second point-in-time copy operation, in response to determining that the timestamp of the mirror data is equal to the timestamp indicated in the command.