W dniu 13.07.2021 o 20:40, Colin Paice pisze:
I am migrating to the latest levels of ADCD ( C4* instead of A4*). During
the migration I would like to be able to mount the A4* volumes on the C4
system, but mount them read only.
I can change the Linux disk to be access mode 444, but if I want to IPL
from A4* I need to change it back again.
The z/OS documentation mentions usingn read-only disks, but I can't see how
to do it. I dont think I can do it from the HCD
OA50068: NEW FUNCTION - PROVIDE READ-ONLY ACCESS FOR SYNCHRONOUS PPRC
SECONDARY DEVICES <https://www.ibm.com/support/pages/apar/OA50068> Looks
like it is only for PPRC.
Short answer: YES
z/OS itself has no "readonly mode" for disks.
However z/OS can work with readonly disks volumes.
How to get such volume?
PPRC secondary - you mentioned it.
More popular scenario is z/OS working as a guest under z/VM. z/VM is
able to provide minidisks in readonly mode.
...
...
However recently new device parameter was added to HCD/IODF. The name of
the parameter is READ-ONLY and it applies to 3390 or 3390B devices.
Disclaimer: I don't know too much about IODF under zPDT, but I believe
OSCONFIG features can be used.
HTH
--
Radoslaw Skorupka
Lodz, Poland
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