Adaptec DuraStor 7220SS Installation And User Manual page 84

DuraStor 6220SS/7220SS Installation and User's Guide
In Figure 3-45, 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.
Host 1
Sees LUN 1
FC HBA
Switch 1
Sees LUN 2
FC HBA
Host 2
FC HBA
Sees LUN 1
Switch 2
FC HBA
Sees LUN 2
Figure 3-45 Active-Active Dual-Port Hubs Disabled, Controller 2 Failure
Active-Active Single-Port Mode
There are several scenarios when you may want to configure the
controllers in active-active single-port mode. In general, these are
situations where the hosts have a single Fibre Channel port, and so
the SAN is not truly fault-tolerant.
3-50
DuraStor FC RAID Appliance
FC2
LUN 2
FC1 LUN 2
Controller 2
P2
P1
FC1 LUN 1
P3
FC2 LUN 2
Controller 1
P4
CH0
CH0
Up to 12 Disk Drives
CH1
CH2
CH1
CH3
Up to 12 Disk Drives
CH2
CH0 Up to 12 Disk Drives
T
CH1
T
CH2 CH3
T
CH3
Up to 12 Disk Drives
T