International Business Machines Corporation
Dynamic disk replication mode selection based on storage area network latency

Abstract:

An aspect includes monitoring, by a server, a round trip latency between a primary storage device and a secondary storage device in a SAN. The secondary storage device replicates the primary storage device in a replication mode that is either an asynchronous replication mode or a synchronous replication mode. Based on the replication mode being the asynchronous replication mode and on detecting that the round trip latency has decreased to a value below a synchronous latency threshold value, the replication mode is set to the synchronous replication mode. Based on the replication mode being the synchronous replication mode and on detecting that the round trip latency has increased to a value above the synchronous latency threshold value, the replication mode is set to the asynchronous replication mode. The monitoring is repeated.