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

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APPENDIX
C
Host Access to Storage
A volume in a virtual disk can be mapped through all controller host ports (target
ports) to all data hosts, or through specific controller host ports to specific data
hosts. Each mapping between a volume and a data host includes a logical unit
number (LUN) that identifies the mapping.
This appendix describes how the controllers present volumes to data hosts in direct
attach and switch attach configurations, during normal operation and after failover.
Failover information only applies to a controller enclosure with two controller
modules installed.
Note – Host-based multipath software should be used in any configuration where
two logical paths between the host and any storage volume may exist at the same
time. This would include most configurations where there are multiple connections
to the host or multiple connections between a switch and the storage.
Topics covered in this appendix are:
■ “Node and Port Identifiers” on page 256
■ “FC Direct Attach Configuration” on page 258
■ “FC Switch Attach Configuration” on page 260
■ “iSCSI Switch Attach Configuration” on page 263
■ “SAS Direct Attach Configurations” on page 265