IBM System Storage Multipath Subsystem Device Driver

The IBM^® System Storage™ Multipath Subsystem Device Driver (SDD) provides redundant connections between a disk storage server and a host server in a storage unit to provide single point failure protection and performance.

You get redundancy with the IBM System Storage Multipath SDD. The SDD resides in the host server with the native disk-device driver for the IBM storage unit. It utilizes redundant connections between disk storage server and host server in a storage unit to provide data availability and performance.

The SDD provides the following functions:

Enhanced data availability
Automatic path failover and failback
Dynamic I/O load-balancing across multiple paths
Multiple path selection policies for the host system
Concurrent download of licensed machine code

For more information about the SDD, see http://www-03.ibm.com/servers/storage/support/software/sdd.