Chapter 6 Storage Networking
Configuring Data Path Failover
Scalar i500 User’s Guide 157
If desired, you can manually switch the active port (see Forcing Data Path
Failover on page 160).
Details about data path failover include:
• The tape drive firmware must be at the version qualified with the
Scalar i500 library (see the Scalar i500 Release Notes for qualified
firmware levels).
• The library must have a Storage Networking license sufficient to
cover the tape drive(s) on which you want to configure data path
failover.
• Both FC ports on the tape drive must be connected to a host or
switch. Neither tape drive port may be connected to a Fibre Channel
I/O blade.
• Data path failover must be enabled on the tape drives (data path
failover is disabled by default).
• Tape drive topology settings must be set to Point to Point.
There are three different types of control path failovers:
• Basic Data Path Failover
• Multi-Data Path Failover
• Advance Data Path Failover
Basic Data Path Failover6
Basic data path failover configurations provide a single path of failover,
and are supported by a fibre switch on the same fabric that supports
NPIV (N_Port ID virtualization) connected to HP LTO-5 and LTO-6
drives.
Multi-Data Path Failover 6
This configuration option requires a Storage Networking license and
allows you to configure dual-port IBM and/or HP LTO-5 and higher
Note: If you are NOT using data path failover on a tape drive, then
only Port 1 is used for data path or control path transmission.
The library and host will not recognize Port 2 unless data path
failover is enabled on the tape drive.
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