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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.
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.
Host 2
FC HBA
FC HBA
Host 1
Switch 1
Switch 2
FC HBA
FC HBA
Sees LUN 1
Sees LUN 2
Sees LUN 1
Sees LUN 2
Up to 12 Disk Drives
Up to 12 Disk Drives
Up to 12 Disk Drives
Up to 12 Disk Drives
P2
FC2
FC1
FC2
FC1
Controller 2
DuraStor FC RAID Appliance
Controller 1
CH0
CH0
CH1
CH1
CH2
CH2
CH3
CH3
CH0
CH1
CH2
CH3
P1
P3
P4
LUN 2
LUN 2
LUN 1
LUN 2
T
T
T
T
DuraStor IUG.book Page 50 Wednesday, January 30, 2002 10:49 AM