During system startup a random set od DASD drives fail to initialize with following messages printed for those devices:
kernel: 0.0.0101: A 64-bit DIAG call failed ... kernel: dasd: 0.0.0101 Setting the DASD online with discipline DIAG failed with rc=-95
- Red Hat Enterprise Linux 7 on IBM Z (mainframe)
- kernel-3.10.0-1127.4.el7.s390x or later
- DASD storage and driver presence
use_diagflag is set (use_diag=1)
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