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. Do I just have to live with changing the access mods to/from 444. Colin
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