User`s manual

D-12
SC936 Chassis Manual
The SAS-936EL2 backplane has two expanders which allow effective failover and
recovery.
D-10 Failover
Single Host Bus Adapter
In a single host bus conguration, the
backplane connects to one Host Bus
Adapter (HBA).
SEC_J2
SEC_J1
SEC_J0
PRI_J2
PRI_J1
B3
B2
B1
A3
A2
A1
PRI_J2
PRI_J1
A3
A2
A1
SAS HBA
Port A
SAS HBA
Single Host Bus Adapter
Failover
If the expander or data path in Port A
fails, the system will automatically fail
over to Port B.
SAS HBA
SAS HBA
Dual Host Bus Adapter
In a dual host bus conguration, 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 will automatically fail
over to Port B. This maintains a full
connection to all drives.
SEC_J2
SEC_J1
SEC_J0
PRI_J2
PRI_J1
B3
B2
B1
A3
A2
A1
PRI_J2
PRI_J1
A3
A2
A1
Port APort B
SEC_J2
SEC_J1
SEC_J0
PRI_J2
PRI_J1
B3
B2
B1
A3
A2
A1
PRI_J2
PRI_J1
A3
A2
A1
Port APort B
SAS HBA
SAS HBA
SEC_J2
SEC_J1
SEC_J0
PRI_J2
PRI_J1
B3
B2
B1
A3
A2
A1
PRI_J2
PRI_J1
A3
A2
A1
Port APort B