Adaptec 1966600 User Guide - Page 82
one LUN, instead of both.
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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. DuraStor FC RAID Appliance Host 1 Sees LUN 1 FC HBA Switch 1 Sees LUN 2 FC HBA P2 P1 Host 2 P3 FC HBA Sees LUN 1 P4 Switch 2 FC HBA Sees LUN 2 CH0 FC2 LUN 2 CH1 FC1 LUN 2 CH2 Controller 2 CH3 FC1 LUN 1 FC2 LUN 2 Controller 1 CH0 T CH1 T CH2 T CH3 T CH0 Up to 12 Disk Drives CH1 Up to 12 Disk Drives CH2 Up to 12 Disk Drives CH3 Up to 12 Disk Drives Figure 3-43 Active-Active Dual-Port Hubs Enabled, Controller 2 Failure 3-48
3-48
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