HP StoreEver MSL6480 Tape Library User and Service Guide Addendum (QU625-96016, October 2013)

Figure 6 Control path port failover example configuration
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8 7
1
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2. Primary data path for drive 1 and active library control path1. Library drive 1 (embedded in library)
4. Primary data path for drive 2 and standby library control path3. Standby data path
6. Library drive 2 (embedded in library)5. Standby data path
8. Primary library control path (logical via control link to drive)7. Standby library control path (logical via control
link to drive)
Technology for drive-assisted failover
The drive-assisted failover features in HP LTO-5 and LTO-6 drives use Fibre Channel switched fabric
features to transfer a drive identity to a different port. The drive manages all of the SCSI
configurations so that the settings expected by the application are still present after the port change.
In a typical multi-path configuration the application must manage both paths and reconfigure the
drive any time the active path is changed.
Both data path port failover and control path port failover require at least one Fibre Channel switch
between the drive and the host to provide some of the features required for failover with minimal
host disruption.
14 Basic control path and data path failover