B-4
DuraStor 412R/6320SS/7320SS Installation and User’s Guide
illustrates the conditions when Controller 2 fails. Note
that both hosts can still see Controller 1’s LUNs (LUN 1) and
Controller 2’s LUNS (LUN 2). However, each host HBA can only
see one LUN, instead of both.
Figure B-2 Controller 2 Failed
Host 2
FC HBA
FC HBA
Host 1
FC HBA
FC HBA
See's LUN 1 & LUN 2
See's LUN 1 & LUN 2
See's LUN 1 & LUN 2
See's LUN 1 & LUN 2
LUN 2
LUN 1
Active
Active
Active
Active
LUN 2
LUN 2
RAID Controller
SEP
T= Location of internal termination
T
T
Controller 1
SAF-TE Disk I/O Card
Disk
CH1
Drives 7 - 12
Drives 1 - 6
Disk
CH2
Disk
CH0
Disk
CH3
FC2
FC1
P1
P2
CH 1
CH 2
P3
P4
HOST I/O
RAID Controller
Controller 2
FAILED
Disk
CH1
Disk
CH2
Disk
CH0
Disk
CH3
FC2
FC1
T
T
T
T
SEP
T
T
I/O Card
CH 0
CH 3
HUB
HUB
Host I/O
Connectors
Disk I/O
Connectors
DuraStor IUG - Online.book Page 4 Friday, July 19, 2002 3:06 PM