What happens during failover with JBoss Cache buddy replication?

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Issue

Please describe failover behaviour of JBoss Cache Buddy Replication.
With numBuddies equal to 1, if a node goes down and its buddy goes down immediately after that, is the data lost?

Environment

Red Hat JBoss Enterprise Application Platform (EAP)
- 4.x
- 5.x
Clustered with buddy replication

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