I'm too lazy for that. On a UNIX she'll prompt, or TSO OMVS, I enter:

chmount -w /
mkdir /bubbaJ
chmount -r /



On Fri, Mar 25, 2022, 15:36 Matt Hogstrom <[email protected]> wrote:

> I’m in a bit of new territory in terms os working with the root file
> system for USS.
>
> I have a small sysplex for development and recently I was looking to
> install some additional software that I’d like to place under a mount point
> off `/`.  I could find something existing but it is more intuitive to add a
> new mount point in root and mount a ZFS over it.
>
> The systems are in a SYSPLEX but all USS filesystems are independent so
> there is no sharing across the systems at this point.
>
> The plex is able to IPL one of three versions of z/OS (2.3, 2.4 or 2.5) at
> a time.
>
> Each version has its own root FS.  My diabolical plan was to run 2.5 and
> then mount the 2.3 and 2.4 file systems using RDWR mode, add the entry,
> unmount, do the next one and then re-ipl. on 2.4 install the new software
> anchored off the new mount point.
>
> When trying to mount one of the older ROOT FS using this MOUNT command
>
> MOUNT FILESYSTEM('OMVS.ROOT.MT24R1') -
>       MOUNTPOINT('/var/omvsroot') -
>       TYPE(ZFS) -
>       MODE(RDWR)
>
> I am getting these messages when attempting to mount as RDWR … READ mounts
> fine.
>
> IOS000I 0AA4,EF,WRI,E7,0200,,56E80000,MT24R1,CATALOG ,
> 80020000A4000C0000000000000000A0A1A2A3A400030000000000E20000000C
> IOS000I 0AA4,EF,WRI,E7,0200,,56E80000,MT24R1,CATALOG ,
> 80020000A4FFFF0000000000000000A0A1A2A3A400030000000000E20056E800
>
> IEC331I 050-018(00201110,MT24R1),MVSZFS,MVSZFS,VMMC,IGG0CLE2
>
> IEF196I IEC331I 050-018(00201110,MT24R1),MVSZFS,MVSZFS,VMMC,IGG0CLE2
> IEF196I IEC161I 037(050,018,IGG0CLE2)-005,MVSZFS,MVSZFS,SYS00019,,,
> IEF196I IEC161I OMVS.ROOT.MT24R1,OMVS.ROOT.MT24R1.DATA,
> IEF196I IEC161I ICF.MIST.USER.CATALOG
>
> IEC161I 037(050,018,IGG0CLE2)-005,MVSZFS,MVSZFS,SYS00019,,, 117
> IEC161I OMVS.ROOT.MT24R1,OMVS.ROOT.MT24R1.DATA,
> IEC161I ICF.MIST.USER.CATALOG
>
> IOEZ00964E DFSMS CATALOG returned error code 50 reason code 12 while
> trying to open aggregate OMVS.ROOT.MT24R1.
>
> As with many things VSAM there is a lot of data and so little
> information.
>
> DIAGNOSE on the VVDS runs clean and indicates no errors.
>
> I’m continuing to diagnose the issue but I presume this should be fairly
> straight forward so any guidance is welcome.
>
> Matt Hogstrom
>
> “It may be cognitive, but, it ain’t intuitive."
> — Hogstrom
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