The FSPM, Device Specific Module (DSM) is a Multipath I/O (MPIO) module on Windows Servers that supports Oracle FS System to manage I/O to storage devices over the data path.
The DSM provides the following features:
- Supports failover across redundant paths
- Controls and manages all data paths to the Oracle FS System LUNs
- Groups multiple data paths to an Oracle FS System LUN and presents this group to the host operating system as a single LUN or drive
- Determines the best path to use to implement load balancing
- Identifies and uses optimized data paths when possible
- Handles data path failover and failback
- Manages data path errors
- Handles reserve and release commands for clustering
A path that provides the best performance is referred to as an optimized path and is the preferred path for data transfer.