Adaptec 412R User Guide - Page 136

LUN 1 and Controller 2's LUNs LUN 2. However, each host, B-4

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Figure B-4 Controller 2 Failed B-6 Host 1 FC HBA See's LUN 1 See's LUN 2 FC HBA Switch 1 HOST I/O P1 P2 Host 2 FC HBA See's LUN 1 FC HBA See's LUN 2 Switch 2 P4 P3 Host I/O Connectors RAID Controller FC1 LUN 1 Disk Active CH1 FC2 LUN 2 Active Disk CH2 Disk CH0 Disk CH3 Controller 1 RAID Controller FC1 LUN 2 In-Active FC2 LUN 2 In-Active Disk T CH1 Disk CH2 T Disk T CH0 Disk CH3 Controller 2 T FAILED Drives 7 - 12 Drives 1 - 6 T= Location of internal termination Disk I/O Connectors T SEP T SEP SAF-TE Disk I/O T T Disk I/O CH 0 CH 3 CH 1 CH 2 In Figure B-4, two hosts are connected via two independent switches. 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. DuraStor 412R/6320SS/7320SS Installation and User's Guide

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B-6
DuraStor 412R/6320SS/7320SS Installation and User’s Guide
In
Figure B-4
, two hosts are connected via two independent
switches. 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-4
Controller 2 Failed
Host 2
FC HBA
FC HBA
Host 1
Switch 1
Switch 2
FC HBA
FC HBA
See's LUN 1
See's LUN 2
See's LUN 1
See's LUN 2
LUN 2
LUN 1
Active
Active
In-Active
In-Active
LUN 2
LUN 2
RAID Controller
SEP
T= Location of internal termination
T
T
Controller 1
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
HOST I/O
RAID Controller
Controller 2
Disk
CH1
Disk
CH2
Disk
CH0
Disk
CH3
FC2
FC1
T
T
T
T
SEP
T
T
Disk I/O
CH 0
CH 3
Host I/O
Connectors
Disk I/O
Connectors
FAILED