Supermicro SC836BE1C-R1K23B User Manual page 97

Failover with RAID Cards and Multiple HBAs
The BPN-SAS2-836EL backplane may be configured for failover with multiple HBAs
using either RAID controllers or HBAs to achieve failover protection.
RAID Controllers: If RAID controllers are used, the failover is accomplished through
port failover on the same RAID card.
HBAs: If multiple HBAs are used to achieve failover protection and load balancing,
Linux MPIO software must be installed and correctly configured to perform
the load balancing and failover tasks.
Dual Host Bus
Adapter
In a dual host bus configuration,
t h e b a c k p l a n e c o n n e c t s t o t w o
HBAs.
Dual Host Bus Adapter
Failover
If the expander or data path in Port
A fails, the system automatically
switches to Port B. This maintains a full
connection to all drives.
IMPORTANT: For RAID controllers, redundancy is achieved through port failover.
For multiple HBAs MPIO software is required to achieve failover protection.
Appendix C Backplane Specifications
SAS HBA
SAS HBA
SEC_J2
Port B
Expander 2
Figure 2EL-7. Dual HBA
SAS HBA
SAS HBA
SEC_J2
Port B
Expander 2
Figure 2EL-7. Dual HBA Failover
C-29
PRI_J2
PRI_J1
SEC_J0 SEC_J1
Port A
Expander 1
PRI_J2
PRI_J1
SEC_J0 SEC_J1
Port A
Expander 1
PRI_J0
PRI_J0