100 Configuration: About Your Host4 Click Action Start.I/O Data Path ProtectionYou can have multiple host-to- array connections for a host. Ensure that youselect all the connections to the array when configuring host access to thestorage array.NOTE: See the Deployment Guide for more information on cabling configurations.NOTE: For more information on configuring hosts see "Configuration: About YourHost" on page 93.If a component such as a RAID controller module or a cable fails, or an erroroccurs on the data path to the preferred RAID controller module, virtual diskownership is moved to the alternate non preferred RAID controller modulefor processing. This failure or error is called failover.Drivers for multi-path frameworks such as Microsoft Multi-Path IO (MPIO)and Linux Device Mapper (DM) are installed on host systems that access thestorage array and provide I/O path failover.For more information on Linux DM please see "Configuration: DeviceMapper Multipath for Linux" on page 177. For more information on MPIOplease see microsoft.com.NOTE: You should have the multi-path driver installed on the hosts at all times,even in a configuration where there is only one path to the storage system, such asa single port cluster configuration.During a failover, the virtual disk transfer is logged as a critical event, and analert notification is sent automatically if you have configured alertdestinations for the storage array.
