Chapter 6 Storage NetworkingConfiguring Host AccessScalar i500 User’s Guide 163Configuring Host AccessHost Access provides a way to limit host access to specific tape drivesand partitions via the library interface.To use host access, you must have a Storage Networking license on thelibrary. The Storage Networking license must be sufficient to cover thetape drive(s) you want to configure for host access.To configure host access, you must first register the host(s) for hostaccess, and enable host access on the desired tape drive(s). Then you willmap the host to the tape drives or partitions you want the host to access.Details about host access include:• A registered host has full access to all tape drives in the library thathave not been enabled for host access, and full access to all tapedrives that are enabled for host access and have been mapped to thathost. A registered host has no access to drives that have been enabledfor host access but are not mapped to that host.• An unregistered host has full access to all tape drives in the librarythat have not been enabled for host access, but no access to tapedrives that have been enabled for host access.• Tape drives that are enabled for host access can only be accessed byregistered hosts that are mapped to them.• Tape drives that are not enabled for host access can be accessed by allhosts.• If the control path and any failover tape drives for a partition areenabled for host access, then only the hosts mapped to that partitionwill be able to send media changer commands to that partition.Unregistered hosts and registered hosts not mapped to that partitionwill not be able to send media changer commands to that partition.However, unregistered hosts and registered hosts that are notmapped to that partition do still have access and can send commandsto any non-host-access-enabled tape drives in the partition, as well asany host-access-enabled tape drives in the partition to which they aremapped.
