Peter, THANK YOU !! Using fdasd option u fixed it up. I was then able to expand the file system and I now have a happy RHEL system on a mod-27 with lots of spare space.
Just FYI... I spent many hours tinkering with VM DRR and Linux dd and different experiments of formatting etc etc. I had a case open with Red Hat, which they eventually pretty much gave up on and gave me the source code for fdasd and dasdfmt (which is where I learned of the --mode expand option in the first place. It’s not in the man pages.) Like so many things, when you know how, it’s simple. Once again, the informal, no-charge listserv community out-performs the paid-for official support. TGFL - Thank God For Listserv. LOL Thanks again. Donald Russell On Fri, Jun 29, 2018 at 05:01 Peter Oberparleiter <ober...@linux.ibm.com> wrote: > On 29.06.2018 00:10, Donald Russell wrote: > > On Thu, Jun 28, 2018 at 14:27 Donald Russell <russell....@gmail.com> > wrote: > >> The dasdfmt -b 4096 --mode=expand worked great. Started formatting the > >> disk at track 150240 as expected. But then fdasd choked saying only the > >> first 10016 cylinders are formatted so I can’t create the new larger > >> partition. > >> > >> How can I coerce fdasd into doing the right thing? Whatever fdasd is > >> looking at for that cylinder count I expected dasdfmt to update. > >> > >> Where is that data, maybe I can just zap it with some other tool like > cms > >> pipe read/write track. > > fdasd is looking at the DASD's VTOC, specifically at the format 5 DSCB > that is supposed to list free space extents on the volume. The 'dasdfmt > --mode expand' call doesn't add the newly formatted extent to this DSCB, > therefore fdasd assumes that that it is not formatted. > > This is a bug/limitation in dasdfmt/fdasd and we plan to fix this in a > future version of s390-tools. > > In the meantime, you can try the following: > > # fdasd /dev/dasd... > u ('re-create VTOC re-using existing partition sizes') > y ('yes') > w ('write table to disk and exit') > > You need to perform these steps TWICE, or fdasd will terminate with a > "BUG..." statement when you try to create/change partitions afterwards. > > > Regards, > Peter Oberparleiter > > -- > Peter Oberparleiter > Linux on Z Development - IBM Germany > > ---------------------------------------------------------------------- > For LINUX-390 subscribe / signoff / archive access instructions, > send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or > visit > http://www.marist.edu/htbin/wlvindex?LINUX-390 > ---------------------------------------------------------------------- > For more information on Linux on System z, visit > http://wiki.linuxvm.org/ > ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 ---------------------------------------------------------------------- For more information on Linux on System z, visit http://wiki.linuxvm.org/