Recovery from failure of primary storage volumes by using mirrored data maintained with host timestamps

A system, comprising:

• a memory;
• and
• a processor coupled to the memory, wherein the processor performs operations, the operations comprising:
• receiving, in a primary storage controller, an input/output (PO) command, wherein a most timestamp is associated with the I/O command;
• communicating, by the primary storage controller during a mirroring of storage volumes to a secondary storage controller, the host timestamp associated with the I/O command to the secondary storage controller, wherein mirrored copies of the storage volumes are timestamped based on at least the host timestamp and an elapsed time since a last host I/O command;
• and
• recovering, from a failure of one or more of the storage volumes in the primary storage controller, by using the timestamped mirrored copies of the storage volumes.

A computer program product, the computer program product comprising:

• a computer readable storage medium having computer readable program code embodied therewith, the computer readable program code configured to perform operations on a processor, the operations comprising:
• receiving, in a primary storage controller, an input/output (I/O) command from a host, wherein a host timestamp is associated with the I/O command;
• communicating, by the primary storage controller during a mirroring of storage volumes to a secondary storage controller, the host timestamp associated with the I/O command to the secondary storage controller, wherein mirrored copies of the storage volumes are timestamped based on at least the host timestamp and an elapsed time since a last host I/O command;
• and
• recovering, from a failure of one or more of the storage volumes in the primary storage controller, by using the timestamped mirrored copies of the storage volumes.