Chapter 10: Storage NetworkingConfiguring Host Access to Storage Networking Drives and PartitionsQuantum Scalar i6000 User’s Guide 363• Viewing All Access Groups on page 396Without host access restrictions, all hosts can view all drives connectedto the SAN and all partitions to which there is a library control path.Host access gives you the ability to deny/restrict access to specific hosts.Details about host access include:• If a control path drive has an SNW license applied to it, it will not beseen by external applications until you create an access group andadd the host and partition to the access group.• Access is granted using “access groups.” An access group is madeup of partitions, drives, and hosts. Drives and partitions can be inmultiple access groups, but each host can only be in one accessgroup.• A partition can be assigned to a host access group if its control pathis through an SNW-licensed tape drive.• Drives must be licensed for SNW before they can be added to accessgroups. Once a drive has been licensed for SNW, it is inaccessible tohosts until they are granted access via the host access feature. SeeLicensing Drives for Storage Networking on page 351.• Tape drives that are licensed for SNW can only be accessed by hoststhat are in the same host access group as the drives.• Tape drives that are not licensed for SNW can be accessed by anyhosts that are zoned to the drives WWPN.• If the control path and any control path failover tape drives for apartition are licensed for SNW, then only the hosts in the sameaccess group as that partition will be able to send medium changercommands to that partition. Hosts not in the same access group asa partition will not be able to send medium changer commands tothat partition. However, hosts that are not in the same access groupas a partition do still have access and can send commands to anynon-SNW-enabled tape drives in that partition.• Host access to a partition means the host can issue media changercommands to the partition.• Host access to a drive means the host can issue SCSI commands tothe drive.
