dasd-eckd.1fd065 <bus ID of the DASD>: Detecting the maximum supported data size for zHPF requests failed
Explanation
High Performance FICON (zHPF) requests are limited to a hardware-dependent
maximum data size. The DASD device driver failed to detect this size and zHPF
is not available for this device.
User response
Set the device offline and online again. If this problem persists, gather
Linux debug data and report the problem to your support organization.