Copying writes from primary storages to secondary storages across different networks

A system operable with a control system, a first network, a second network, and secondary storages, comprising:

• a first group of at least one primary device and at least one corresponding primary storage, wherein writes to one the at least one corresponding primary storage in the first group are copied to at least one corresponding secondary storage;
• a second group of at least one primary device and at least one corresponding primary storage, wherein writes to the at least one corresponding primary storage in the second group are copied to at least one corresponding secondary storage;
• a first storage manager, executed by the at least one primary device in the first group, to cause the at least one primary device in the first group to perform operations, the operations comprising:
• communicating, using a first network protocol, a failure notification over the first network to the control system in response to the primary device in the first group determining that a write to the corresponding primary storage cannot be copied to the corresponding secondary storage;
• receiving, from the control system using the first network protocol, a freeze command at the at least one primary device in the first group;
• suspending the copying of writes from the at least one corresponding primary storage in the first group to the at least one corresponding secondary storage in response to receiving the freeze command from the control system;
• a second storage manager, executed by the at least one primary device in the second group, to cause the at least one primary device in the second group to perform operations, the operations comprising:
• communicating, using a second network protocol, a failure notification over the second network to the control system in response to the primary device in the second group determining that a write to the corresponding primary storage cannot be copied to the corresponding secondary storage;
• receiving, from the control system using the second network protocol, a freeze command at the at least one primary device in the first group;
• and
• suspending the copying of writes from the at least one corresponding primary storage in the second group to the at least one corresponding secondary storage in response to receiving the freeze command from the control system.

An article of manufacture including a first storage manager and a second storage manager, wherein the first storage manager is executed by at least one primary device in a first group also including at least one corresponding primary storage, wherein writes to the at least one corresponding primary storage in the first group are copied to a corresponding secondary storage, wherein the second storage manager is executed by at least one primary device in a second group also including at least one corresponding primary storage, wherein writes to the at least one corresponding primary storage in the second group are copied to a corresponding secondary storage, wherein the first and second storage managers are executed to communicate with a control system and to cause operations, the operations comprising:

• communicating, by the first storage manager, a failure notification using a first network protocol to the control system in response to determining that a write to the primary storage cannot be copied to a corresponding secondary storage;
• communicating, by the second storage manager, a failure notification using a second network protocol to the control system in response to determining that a write to the corresponding primary storage cannot be copied to a corresponding secondary storage;
• receiving, by the first storage manager, from the control system using the first network protocol, a freeze command at the at least one primary device in the first group;
• receiving, by the second storage manager, from the control system using the second network protocol, a freeze command at the at least one primary device in the second group;
• and
• suspending the copying of writes, by the first and second storage managers, from the primary storages in the first and second groups to the corresponding secondary storages in response to receiving the freeze commands.