IBM Systems Group
LUN Transfer to Alternate Controller
DS4000 transfers LUNs to alternate controller
Volumes are owned by one controller
Volumes can be accessed through both controllers
Volume ownership is always transferred to the controller that is used for volume access
Two multipathing solutions available
QLogic failover driver uses AVT
Difficult to configure
Potential LUN thrashing
RDAC uses inband communication
Self configuring
Suitable for data sharing scenarios
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