Datasheet

3-2
Backplane User's Guide
The SC933EL2 Backplane has two expanders which allow effective failover and
recovery.
3-2 Failover
Single Host Bus Adapter
In a single host bus configuration, 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
PRI_J0
PRI_EEPROM
A3
A2 A1
SAS HBA
Port A Port B
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 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 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
PRI_J0
PRI_EEPROM
A3
A2 A1
Port A Port B
SEC_J2
SEC_J1
SEC_J0
PRI_J2
PRI_J1
B3
B2
B1
A3
A2
A1
PRI_J2
PRI_J1
PRI_J0
PRI_EEPROM
A3
A2 A1
Port A Port 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
PRI_J0
PRI_EEPROM
A3
A2 A1
Port A Port B