HP P6000 Continuous Access Implementation Guide (T3680-96431, August 2012)

7 Failover and recovery
This chapter provides information about failing over and resuming operations after a planned or
unplanned loss of operation. The several scenarios describe situations you may encounter, with
procedures for handling each scenario.
Failover example
Figure 53 (page 102) shows data replication among DR groups at three locations. Arrays 1 and 4
are at the local site, and arrays 2 and 5 are at a remote site. On the local site, array 1 contains
source virtual disks in a DR group (replicating to array 2), and array 4 contains destination virtual
disks (replicated from array 5). If the arrays at the local site become unavailable, the DR group
on array 2 fails over and becomes source virtual disks (in failover state), making the destination
volumes in the DR group available to hosts connected to array 2, so that processing can resume
at the remote site using array 2. On array 5, the DR group begins logging until the failed site is
re-established or replaced with another destination. Array 2 will also start to log if the replication
mode being used is synchronous.
Failover example 101