Supermicro SC846BE1C-R1K23B User Manual page 106

SC846 Chassis Manual
C-12 Failover with RAID Cards and Multiple HBAs
The SAS-836EL backplane may be configured for failover with multiple HBAs using
either RAID controllers or HBAs to acheive failover protection.
RAID Controllers: If RAID controllers are used, then 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, the
backplane connects to two Host Bus
Adapters (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 connec-
tion to all drives.
IMPORTANT: For RAID controllers, redundancy is achieved through port failover.
For multiple HBAs MPIO software is required to achieve failover protection.
SAS HBA
SAS HBA
SEC_J2
Port B
Expander 2
J17
Figure C-8: Dual HBA
SAS HBA
SAS HBA
SEC_J2
Port B
Expander 2
J17
Figure C-9: Dual HBA Failover
C-12
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