HP StorageWorks MSA2012i HP StorageWorks 2000 Modular Smart Array Reference Gu - Page 266
SAS Storage Presentation During Normal Operation High
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If a controller fails, the hosts maintain access to all of the volumes through the host ports on the surviving controller, as shown below. A0 WWN, No data A & B volumes A1 WWN, A & B volumes No data A0 A1 B0 B1 (Failed) Figure 7-3 SAS Storage Presentation During Failover (High-Availability, DualController, 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. B0 WWN, A & B volumes A0 WWN, A & B volumes A1 WWN, A & B volumes B1 WWN, A & B volumes A0 A1 B0 B1 Figure 7-4 SAS Storage Presentation During Normal Operation (HighAvailability, Dual-Controller, Direct Attach with Four Hosts) 266 HP StorageWorks 2000 Family Modular Smart Array reference guide • August 2008