Adic Scalar I500 Driver For Mac

We have HP-UX 11.31 ia64 hosts that have Scalar i500 tape library drives presented to them. We noticed that after rebooting the tape library, these tape devices appear as 'CLAIMED' but 'offline' in ioscan output as shown here. I found this in an HP knowledge base document: The ioscan -P health command output displayed by ioscan is picking up the health value from the io tree. This health value is updated by estape driver using escsi routines on getting path online/offline notifications from the interface driver. The health status is marked offline if there are no paths available to the device.

Adic Scalar I500 Driver For Mac

This is done on the path change notification from the interface driver to the estape driver. This means that there are no active paths to the tape device at this point. A subsequent open will try out available paths, and then if an active path is present that will be used. An event notification from the interface card to the tape device will trigger the estape driver to mark the health status as online. The tape device should be online most of the times, and will be offline when there is an access problem due to no available paths to the tape device. In summary, the tape state is changed to offline when the driver loses connection with the tape drive. The health state can be changed to online by accessing (reading from / writing to) the tape drive.