IBM Systems Group
AIX-AK FZK 2005 © 2005 IBM Corporation
LUN Transfer to Alternate Controller
DS4000 transfers LUNs to alternate controller
Volumes are owned by one controller
Volumes can be accessed through both cont rollers
Volume ownership is always transferred to th e controller that is used
for volume access -> transfer time approx 1 s
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