Chapter 6 Storage Networking
Configuring Data Path Failover
Scalar i500 User’s Guide 158
drives for multi-data path operation when both ports are enabled for host
access. To configure drives for Multi-Data Path access, host application
support is required in support of redundant path access.
Multi-Data Path configurations are supported for dual ported IBM
and/or HP LTO-5 and higher Fibre Channel (FC) drives. In addition to
the dual port FC drives, you need the following:
• A Storage Networking license must be installed on the library and the
associated drive count must be sufficient to cover all drives involved
in the multi-path configuration.
• The tape drives must NOT be connected to an FC I/O blade.
Advanced Data Path
Failover (ADPF) 6
This configuration provides support for Storage Networking-licensed
IBM LTO-5 FC and higher drives. APF supports control path as well as
data path failover support. This configuration requires hosts to have the
Advanced Path Failover Driver for IBM Drives installed. This driver will
determine and handle control path and data path selections in the event
of connection path failures. If both control path and data path failover are
configured, the control path will not fail over to another tape drive unless
both ports on the control path tape drive have failed.Unlike the multi-
path configuration which reports redundant connection paths to the
application, requiring the application to route and handle multiple
connection paths to the same device, the advanced path failover solution
shields applications from handling multiple connection paths to a drive
and/or library partition. The Advanced Path Failover Driver for IBM
drives will report just one device connection and handle all redundant
path and path selections in the event of communication path failures and
path failover recovery operation.
Advanced Data Path Failover configurations are supported for dual-
ported IBM LTO-5 and higher FC drives. In conjunction with an installed
Advanced Path Failover Driver for IBM Drives, the driver will use one of
the supported drive connections to communicate drive requests, and in
the event of a connection failure, use the redundant connection path to
continue drive operation.
To configure a tape drive for advanced data path failover, you need the
following:
• A Storage Networking license must be installed on the library and the
associated drive count must be sufficient to cover all drives involved
in the advanced data path configuration.
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