HP StoreEver Tape Libraries Failover User Guide (5697-3323, June 2014)

Figure 18 Device manager window
Device firmware
These two Windows drivers work in conjunction with firmware in the library and tape devices.
The special firmware ensures that the host computer and devices stay synchronized on state and
position information. The advanced path failover device drivers hide the details of this from the
rest of the system.
The objective is for the rest of the system (including all applications running on the system and all
other device drivers) to see a single changer or tape device, but not the redundant paths to the
failover-enabled devices. If a path failure occurs, it should be transparent to the rest of the system
including applications. If a path fails, the drivers work with the device to transfer communication
to a new path and recover the command that was in process when the path failed.
42 Installing and using Windows advanced path failover drivers