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Chapter 1. Device Mapper Multipathing
Device Mapper Multipathing (DM-Multipath) allows you to configure multiple I/O paths between server nodes and storage arrays into a single device. These I/O paths are physical SAN connections that can include separate cables, switches, and controllers. Multipathing aggregates the I/O paths, creating a new device that consists of the aggregated paths.
1.1. New and Changed Features for Red Hat Enterprise Linux 5.7
Red Hat Enterprise Linux 5.7 includes the following documentation and feature updates and changes.
- The new configuration file parameters
fast_io_fail_tmo,dev_loss_tmo, andfile_timeoutare documented in Chapter 4, The DM-Multipath Configuration File.
- The procedure for ensuring that multipath devices names are consistent across the nodes in a cluster has been expanded in Section 2.2, “Consistent Multipath Device Names in a Cluster”.
