Multipath target

modulename: dm-multipath.ko

configname: CONFIG_DM_MULTIPATH

Linux Kernel Configuration
└─>Device Drivers
└─>Multiple devices driver support (RAID and LVM)
└─>SCSI Device Handlers
└─>Multipath target
In linux kernel since version 2.6.20 (release Date: 2007-02-04)  
Allow volume managers to support multipath hardware.

source code: