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DuraStor 6220SS/7220SS Installation and User’s Guide
Figure 3-43
illustrates the conditions when Controller 2 fails. Note
that both hosts can still see Controller 1’s LUNs (LUN 1) and
Controller 2’s LUN (LUN 2); however, each host HBA can only see
one LUN, instead of both.
Figure 3-43 Active-Active Dual-Port Hubs Enabled, Controller 2 Failure
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 48 Wednesday, January 30, 2002 10:49 AM