HP StorageWorks 2000 Modular Smart Array Reference Guide (481599-003, August 2008)

266 HP StorageWorks 2000 Family Modular Smart Array reference guide • August 2008
If a controller fails, the hosts maintain access to all of the volumes through the host
ports on the surviving controller, as shown below.
Figure 7-3 SAS Storage Presentation During Failover (High-Availability, Dual-
Controller, Direct Attach with Two Hosts)
In the following configuration, each host has a non-redundant connection to all
mapped volumes. If a controller fails, the hosts connected to the surviving controller
maintain access to all volumes owned by that controller.
Figure 7-4 SAS Storage Presentation During Normal Operation (High-
Availability, Dual-Controller, Direct Attach with Four Hosts)
A0 A1
B0 B1
No
data
No
data
A0 WWN,
A & B volumes
A1 WWN,
A & B volumes
(Failed)
A0 A1
B0 B1
B0 WWN,
A & B volumes
B1 WWN,
A & B volumes
A0 WWN,
A & B volumes
A1 WWN,
A & B volumes