
%         Registration                       Linux Multipathing               
%  [2]Register/Submit Proposal Ed Goggin (egoggin@emc.com)                    

Linux multipathing provides I/O failover and   
path load sharing for multipathed block        
devices. In this paper, we provide an overview 
of the current device mapper based             
multipathing capability and use authentic      
customer configurations to drive Enterprise    
level requirements for future multipathing     
enhancements. We describe the interaction      
amongst kernel multipathing modules, user mode 
multipathing tools, hotplug, udev, and kpartx  
components when considering use cases. Use     
cases include path and logical unit            
re-configuration, partition management, and    
path failover for both active-active and       
active-passive generic storage systems. We     
also describe lessons learned during testing   
the MD scheme on high end storage systems.     

