Abstract: A first volume is maintained at a primary site and a second volume is maintained at a secondary site, where operations to mirror the first volume at the primary site to the second volume at the secondary site are performed while other volumes of the primary site and the secondary site are maintained in a remote copy relationship. Input/Output (I/O) operations comprising writing a metadata on the first volume at the primary site are performed and corresponding read I/O operations are performed on the second volume at the secondary site. In response to determining that the metadata read in two consecutive read I/O operations on the second volume at the secondary site does not reflect updates as requested to be made to the first volume at the primary site, determining that the primary site has failed.

Abstract: Described herein are techniques for managing failover in a data center environment interconnected using an internet small computer systems interface (iSCSI) communication protocol, the techniques including receiving, at a host and from a kernel driver, an asynchronous message comprising an indication of a failed path associated with a first node having a first port, a list of internet protocol (IP) addresses associated with a plurality of failover paths including a first failover path associated with a second node having a second port, and an expiration. The techniques further including performing, by the host and before the expiration, a first input/output (I/O) operation on the second port associated with the second node. The techniques further including performing, by the host and after the expiration, a second I/O operation on the first port of the first node.

Abstract: Described herein are techniques for managing failover in a data center environment interconnected using an internet small computer systems interface (iSCSI) communication protocol, the techniques including receiving, at a host and from a kernel driver, an asynchronous message comprising an indication of a failed path associated with a first node having a first port, a list of internet protocol (IP) addresses associated with a plurality of failover paths including a first failover path associated with a second node having a second port, and an expiration. The techniques further including performing, by the host and before the expiration, a first input/output (I/O) operation on the second port associated with the second node. The techniques further including performing, by the host and after the expiration, a second I/O operation on the first port of the first node.