Multipathing software enables you to define and control redundant physical paths to I/O devices such as storage devices and network interfaces. If the active path to a device becomes unavailable, the software can automatically switch to an alternate path to maintain availability. This capability is known as automatic failover. To take advantage of multipathing capabilities, you must configure the server with redundant hardware, such as redundant network interfaces or two host bus adapters connected to the same dual-ported storage array.
For the Sun SPARC Enterprise T5120 or T5220 servers, three different types of multipathing software are available:
Solaris IP Network Multipathing software provides multipathing and load--balancing capabilities for IP network interfaces.
VERITAS Volume Manager (VVM) software includes a feature called Dynamic Multipathing (DMP), which provides disk multipathing as well as disk load balancing to optimize I/O throughput.
Sun StorageTek Traffic Manager is an architecture fully integrated within the Solaris OS (beginning with the Solaris 8 release) that enables I/O devices to be accessed through multiple host controller interfaces from a single instance of the I/O device.
For instructions on how to configure and administer Solaris IP Network Multipathing, consult the IP Network Multipathing Administration Guide provided with your specific Solaris release.
For information about VVM and its DMP feature, refer to the documentation provided with the VERITAS Volume Manager software.
For information about Sun StorageTek Traffic Manager, refer to your Solaris OS documentation.