Multipath support for hosts running the Linux operating system

Settings for Linux hosts
To ensure path recovery in failover scenarios, certain Device Mapper Multipath (DMMP) settings and udev rules for the attachment of Linux hosts to FlashSystem V840 are recommended. These settings are valid for IBM® System x®, all Intel or AMD-based servers, and Power® platforms.

Configuring Device Mapper Multipath (DMMP) tool for hosts running the Linux operating system
Before configuring the Linux operating system for a host that attaches to the FlashSystem V840, ensure that the correct Device Mapper Multipath Tool (DMMP) has been installed and configured correctly for the Linux hosts which use DMMP as a multipath driver. Currently Red Hat Enterprise Linux 5 and later and SUSE Linux Enterprise Server 11 support DMMP as a multipath driver and ship it on a distribution disc.

SDD dynamic pathing on hosts running the Linux operating system
Hosts that run the Linux operating system do not support subsystem device driver (SDD) dynamic pathing. If you use a QLogic or Emulex device driver, you must reload the device driver to pick up the new paths.

Multipathing configuration maximums for hosts running the Linux operating system
When you configure, keep in mind the maximum configuration for the subsystem device driver (SDD) on Intel-based hosts that run the Linux operating system.