Active-active remote configuration of a storage system

A storage system, comprising:

• a primary storage system comprising a primary logical volume;
• a secondary storage system comprising a secondary logical volume, wherein the secondary logical volume is configured as a mirror of the primary logical volume, so that the primary and secondary logical volumes form a single logical mirrored volume;
• and
• a controller which is configured to:
• receive, at the secondary storage system, from a host a command to write data to the secondary storage system,
• transmit the command to the primary storage system,
• write the data to the primary storage system, and
• write the data to the secondary storage system subsequent to writing the data to the primary storage system, wherein:
• the secondary storage system is configured to receive a write permission from the primary storage system,
• subsequent to receiving the write permission, the secondary storage system is configured to write to the secondary logical volume, and
• the primary storage system is configured to write to the secondary logical volume without permission.

A computer software product for storing data in a computing system including a primary storage system and a secondary storage system in communication with the primary storage system, the product comprising a non-transitory computer-readable medium having program instructions recorded therein, which instructions, when read by a computer, cause the computer to:

• receive, at the secondary storage system, from a host a command to write data to the secondary storage system;
• transmit the command to the primary storage system;
• write the data to the primary storage system;
• and
• write the data to the secondary storage system subsequent to writing the data to the primary storage system, wherein:
• the secondary storage system is configured to receive a write permission from the primary storage system,
• subsequent to receiving the write permission, the secondary storage system is configured to write to the secondary storage system, and
• the primary storage system is configured to write to the secondary storage system without permission.