AIX SDD (subsystem device driver)
SDD is designed to support the multipath configuration in the ESS. The software used to balance ESS I/O traffic across all adapters. It provides multiple access to data from the host. when using sdd cfgmgr is run 3 times (cfgmgr -l fcs0, cfgmgr -l fcs1, cfgmgr (the third one builds the vpaths)) 3 policies exist …