5.0 Managing Multipath I/O for Devices This section describes how to manage failover and path load balancing for multiple paths between the servers and block storage devices.
"Chapter 4. The DM-Multipath Configuration File 4.1. Configuration File Overview 4.2. Configuration File Blacklist 4.2.1. Blacklisting by WWID 4.2.2. Blacklisting By Device Name 4.3. Configuration File Defaults 4.4. Multipaths Device Configuration Attributes 4.5. Configuration File Devices By default, DM-Multipath provides configuration values for the most common uses of multipathing. In addition, DM-Multipath includes support for the most common storage arrays that support DM-Multipath. The default configuration values and the supported devices can be found in the /usr/share/doc/device-mapper-multipath-0.4.5/multipath.conf.defaults file. "
device-mapper (dm): working with multipath-tools. Part 1 Filed under: SCSI, Linux — admin @ 10:33 Device-mapper (hereafter, dm) is one of the best collection of device drivers that I have ever worked with. It brings high availability, flexibility and more to the Linux 2.6 kernel. Device-mapper is a Linux 2.6 kernel infrastructure that provides a generic way to create virtual layers of a block device while supporting stripping, mirroring, snapshots, concatenation, multipathing, etc. While many modules are built on top of device-mapper, the focus of this article is on multipath-tools. Note that I will be using the terms multipath, multipath-tools and dm-multipath interchangeably to signify the same package. Also note that dm-multipath is the name of the repackaged multipath-tools redistributed under Red Hat in their Advanced Server Linux distribution.