C-29
Appendix C Backplane Specifications
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.
PRI_J0
PRI_J1
PRI_J2
SEC_J0
SEC_J1
SEC_J2
SAS HBA
Port A
Expander 1
Port B
Expander 2
SAS HBA
Dual Host Bus
Adapter
In a dual host bus configuration,
the backplane connects to two
HBAs.
Figure 2EL-7. Dual HBA
PRI_J0
PRI_J1
PRI_J2
SEC_J0
SEC_J1
SEC_J2
SAS HBA
Port A
Expander 1
Port B
Expander 2
SAS HBA
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.
Figure 2EL-7. Dual HBA Failover
IMPORTANT:
For RAID controllers, redundancy is achieved through port failover.
For multiple HBAs MPIO software is required to achieve failover protection.
Summary of Contents for SC836 Series
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