B-9
SAN Solution Strategies (DuraStor 7320SS only)
Hubs Disabled (Single External Hub)
shows the hosts in a single loop configuration using an
external hub. When a controller failover occurs, this configuration
operates much the same as the previous one which uses a switch.
The advantage is that a hub is less expensive. In active-active dual-
port mode, you must manage the multiple images of the same LUN.
Figure B-6 Single-Loop Configuration
Host 2
FC HBA
Host 1
Hub
FC HBA
Host Link 1
Host Link 2
LUN 1
Passive
LUN 1
Active
LUN 2
Passive
LUN 2
Active
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
I/O Card
CH 0
CH 3
Host I/O
Connectors
Disk I/O
Connectors
DuraStor IUG - Online.book Page 9 Friday, July 19, 2002 3:06 PM