
A-23
Theory of Controller Operation
and
illustrate the active-passive mode
logical functions when the controllers are operating in a normal
condition and then in a failed condition.
Figure A-16 Active-Passive Dual-Port, Hubs Enabled, Controller 1 Active
Figure A-17 Active-Passive Dual-Port, Hubs Enabled, Controller 1 Failed
Host I/O
Connectors
Drive I/O Connectors
Controller FC Host Ports
RAID Controller
SEP
T= Location of internal termination
T
T
Controller 1
ACTIVE
PASSIVE
SAF-TE Disk I/O
Disk
CH1
Drives 7 - 12
Drives 1 - 6
Disk
CH2
Disk
CH0
Disk
CH3
FC2
FC1
P1
P2
CH 1
CH 2
P3
P4
Active
HOST I/O
Active
RAID Controller
Controller 2
Disk
CH1
Disk
CH2
Disk
CH0
Disk
CH3
FC2
FC1
Passive
Passive
T
T
T
T
Controller Disk Ports
SEP
T
T
Disk I/O
CH 0
CH 3
HUB
HUB
Host I/O
Connectors
Drive I/O Connectors
Controller FC Host Ports
RAID Controller
SEP
T= Location of internal termination
T
T
Controller 1
FAILED
ACTIVE (FAILED OVER)
SAF-TE Disk I/O
Disk
CH1
Drives 7 - 12
Drives 1 - 6
Disk
CH2
Disk
CH0
Disk
CH3
FC2
FC1
P1
P2
CH 1
CH 2
P3
P4
Inactive
HOST I/O
Inactive
RAID Controller
Controller 2
Disk
CH1
Disk
CH2
Disk
CH0
Disk
CH3
FC2
FC1
Active
Active
T
T
T
T
Controller Disk Ports
SEP
T
T
SCSI I/O
CH 0
CH 3
HUB
HUB
DuraStor IUG - Online.book Page 23 Friday, July 19, 2002 3:06 PM