Hi Alex, Thank you for replied, What do I mean is, not to create the KSC as a cluster, but act as a failover. Yes I know that if the KSC is crash and it can be restored quickly using the latest backup. However, since many of our customers/users asking if the KSC can support failover-active/passive situation. So maybe we can suggest this situation. 1 more question, if 1st ksc down/crash, how the 2nd ksc take over the database from 1st ksc?. The replication of data or data mirroring is it real time?