Radoslaw, FYI. zPDT does not have an IODF. zPDT does not emulate a z machine. It emulates only a z LPAR. The equivalent of the IODF is supplied via an editable file which defines the environment in which the z/OS (or z/VM or other) operating system works. Thus several z capabilities are not available. SG24-8205 has all the gory details.
For me the worst is the inability to run a TKE or any sort of TKE emulator. This in turn is one reason I cannot run ICSF with an emulated crypto processor in EP11 mode. Lennie Dymoke-Bradshaw https://rsclweb.com ‘Dance like no one is watching. Encrypt like everyone is.’ -----Original Message----- From: IBM Mainframe Discussion List <[email protected]> On Behalf Of Radoslaw Skorupka Sent: 14 July 2021 16:15 To: [email protected] Subject: Re: Can I define a disk as read only to z/OS? 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 ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
