Dell Acceleration Appliances for Databases - Manual (Page 36)

The diagram below shows basic LUN access (exported volumes) in an HA configuration.
LUN 0 LUN 0
LUN 1 LUN 1
LUN 0 LUN 1
40Gb
In this simplified example, Node 1 presents LUN 0 to the application, while Node 2 presents LUN 1 to
the application. All writes to LUN 0 are synchronously replicated to Node 2. All writes to LUN 1 are
synchronously replicated to Node 1. When the replication is complete, the original node
acknowledges the write by the application.
Replication occurs over the 40Gb Ethernet interconnect between the two nodes, which consists of
two dual-ported ConnectX®-3 adapters. In the event a node fails, all data will be available from the
remaining active unit.
ISCSI CONNECTIONS FOR HA
iSCSI systems use dual-port ConnectX®-3 cards for cluster interconnections.
For HA systems, the two ports on the interconnect card are “split” – one port on each of the first
two ConnectX®-3 cards is used for the cluster interconnect, and one is used for the fabric
connection. See the
First Boot Setup section for details and dialogs regarding cluster setup, and refer
to Split-Function Ports for iSCSI – Dell R720 in Appendix A: Dell PowerEdge R720 Configuration for
details on split-port configuration.
Node 1 Node 2
40Gb
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