
6-3
Chapter 6: Advanced Setup
6-3 Failover
Failover is the ability to automatically switch to a redundant path when a primary
path fails or becomes unavailable. Failover is automatic and requires no action on
the part of the administrator.
The BPN-SAS2-836EL2 backplane has two expanders which allow effective failover
and recovery. This feature is not supported by the BPN-SAS2-836EL1 backplane.
Single Host Bus Adapter
In a single host bus conguration, the
backplane connects to one host bus
adapter.
PRI_J0
PRI_J1
PRI_J2
SEC_J0 SEC_J1
SEC_J2
J17
WWN
SAS HBA
Port A
Expander 1
Port B
Expander 2
PRI_J0
PRI_J1
PRI_J2
SEC_J0 SEC_J1
SEC_J2
J17
WWN
SAS HBA
Port A
Expander 1
Port B
Expander 2
Single Host Bus Adapter
Failover
If the expander or data path in Port A
fails, the system will automatically fail
over to Port B.
J0
J0
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