Failover - Supermicro SC216 Series User Manual

D-12 Failover
The SAS-216EL2 backplane has two expanders which allow effective failover and
recovery.
Single Host Bus Adapter
In a single host bus configuration, the
backplane connects to one host bus
adapter (HBA).
Single Host Bus Adapter

Failover

If the expander or data path in Port A
fails, the system automatically switches
to Port B.
Dual Host Bus Adapter
In a dual host bus configuration, the
backplane connects to two HBA's.
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.
Appendix D SAS-216EL Backplane Specifications
SAS HBA
J2
1
2
MH1
C243 C241 C252 C245 C251 C250 C240 C249 C246 C248 C247
C242 C253 C244
D1
PRI_EXP1
C76 U2 BC1
R11 R5
C178 R112
Rev:1.01
MH4
PRI_MODE1
Port B
Expander 2
Figure D-7. Single HBA
SAS HBA
J2
1
2
MH1
C243 C241 C252 C245 C251 C250 C240 C249 C246 C248 C247
C242 C253 C244
D1
PRI_EXP1
C76 U2 BC1
R11 R5
C178 R112
Rev:1.01
MH4
PRI_MODE1
Port B
Expander 2
Figure D-8. Single HBA Failover
SAS HBA
J2
1
2
MH1
C243 C241 C252 C245 C251 C250 C240 C249 C246 C248 C247
C242 C253 C244
D1
C76 U2 BC1
R5
R11
R112
C178
Rev:1.01
MH4
PRI_MODE1
Port B
Expander 2
Figure D-9. Dual HBA
SAS HBA
SAS HBA
J2 1
2
MH1
C243 C241 C252 C245 C251 C250 C240 C249 C246 C248 C247
C242 C253 C244
D1
C76 U2 BC1
R5
R11
C178 R112
Rev:1.01
MH4
PRI_MODE1
Port B
Expander 2
Figure D-10. Dual HBA Failover
D-11
J2
1
2
MH1
MH2
C240 C249
C243 C241 C252 C245 C251 C250 C246 C248 C247
C253
C242 C244
D1
PRI_J1
U2 BC1
PRI_J2 C76 R5
R11
C178 R112
Rev:1.01
MH3
MH4
PRI_J3
PRI_MODE1
Port A
Expander 1
J2 1
2
MH1
MH2
C243 C241 C252 C245 C251 C250 C240 C249 C246 C248 C247
C242 C253 C244
D1
C76 U2 BC1
PRI_J1 R5
R11
PRI_J2
C178 R112
Rev:1.01
MH3 MH4
PRI_J3 PRI_MODE1
Port A
Expander 1
SAS HBA
J2
1
2
MH1
MH2 C240 C249
C243 C241 C252 C245 C251 C250 C246 C248 C247
C253
C242 C244
D1
C76 U2 BC1
R5
R11
PRI_EXP1 C178 R112
PRI_J1
PRI_J2 Rev:1.01
MH4
MH3
PRI_MODE1
PRI_J3
Port A
Expander 1
J2 1
2
MH1
MH2
C243 C241 C252 C245 C251 C250 C240 C249 C246 C248 C247
C242 C253 C244
D1
C76 U2 BC1
PRI_EXP1 R5
PRI_J1 R11
PRI_J2 C178 R112
Rev:1.01
MH4
MH3
PRI_MODE1
PRI_J3
Port A
Expander 1
MH2
PRI_EXP1
PRI_J1
PRI_J2
MH3
PRI_J3
MH2
PRI_EXP1
PRI_J1
PRI_J2
MH3
PRI_J3
MH2
PRI_EXP1
PRI_J1
PRI_J2
MH3
PRI_J3
MH2
PRI_EXP1
PRI_J1
PRI_J2
MH3
PRI_J3