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Dell EMC PowerVault MD 34XX/38XX Series Storage Arrays Administrator's Guide

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I/O data path protection

You can have multiple host-to-array connections for a host. Ensure that you select all the connections to the array when configuring host access to the storage array.
NOTE: See the Deployment Guide for more information about cabling configurations.
NOTE: For more information about configuring hosts, see About Your Host.

If a component such as a RAID controller module or a cable fails, or an error occurs on the data path to the preferred RAID controller module, virtual disk ownership is moved to the alternate non-preferred RAID controller module for processing. This failure or error is called failover.

Drivers for multipath frameworks such as Microsoft Multi-Path IO (MPIO) and Linux Device Mapper (DM) are installed on host systems that access the storage array and provide I/O path failover.

For more information about Linux DM, see Device Mapper Multipath for Linux. For more information about MPIO, see Microsoft.com.

NOTE: You must have the multipath driver installed on the hosts always, even in a configuration where there is only one path to the storage system, such as a single port cluster configuration.

During a failover, the virtual disk transfer is logged as a critical event, and an alert notification is sent automatically if you have configured alert destinations for the storage array.

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