RESYNCHRONIZING TO A FIRST STORAGE SYSTEM AFTER A FAILOVER TO A SECOND STORAGE SYSTEM MIRRORING THE FIRST STORAGE SYSTEM

摘要

Provided are a computer program product, system, and method for performing a failover between a first storage system and a second storage system. Data is synchronized between the first storage system and the second storage system. A failover is performed from the first storage system to the second storage system in response to a failover event at the first storage system while synchronizing the data. A determination is made that a first storage unit of the first storage system is inoperable and that that a second storage unit of the first storage system is operable in response to the failover event. In response to determining that the second storage unit is operable, a resynchronization is initiated to copy updates to a second storage unit of the second storage system mirroring the second storage unit of the first storage system to the second storage unit of the first storage system.

主权项

1. A computer program product for performing a failover between a first storage system and a second storage system, wherein the computer program product comprises a computer readable storage medium having program instructions embodied therewith, the program instructions executable by a processor to cause operations, the operations comprising:
synchronizing data between the first storage system and the second storage system; performing a failover from the first storage system to the second storage system in response to a failover event at the first storage system while synchronizing the data, wherein Input/Output (I/O) requests to the first storage system are redirected to the second storage system as part of the failover; determining that a first storage unit of the first storage system is inoperable in response to the failover event; determining that a second storage unit of the first storage system is operable in response to the failover event; and in response to determining that the second storage unit is operable, initiating a resynchronization to copy updates to a second storage unit of the second storage system mirroring the second storage unit of the first storage system to the second storage unit of the first storage system while I/O requests are being redirected to the second storage system.