I have RHEL 7 system on a mod-9 (10016 cup) ECKD DASD and want to move it to a mod-27 (32759 cyl).
The disk is not in use, I used zVM/CMS to DDR the disk to the larger one. Then I attached it to a zLinux system to format the back end of the disk. After that I would remove the last partition and create a new partition extending to the end of disk and finally resize the file system in that partition. 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. I also tried dasdfmt --mode=quick which fixed my fdasd issue. It now got the right size of the disk but that removes the IPL record and who knows what else so the disk was no longer bootable. Any suggestions beyond install from scratch on the larger disk? :-) Thanks, Don Thu 28 Jun 20:58:17 UTC [root@sl55zdump] ~ #dasdfmt -b 4096 --mode=expand /dev/dasdr Expansion mode active. Searching for starting position... Done. Unformatted part starts at track 150240. Drive Geometry: 32759 Cylinders * 15 Heads = 491385 Tracks I am going to format the device /dev/dasdr in the following way: Device number of device : 0x200 Labelling device : yes Disk label : VOL1 Disk identifier : 0X0200 Extent start (trk no) : 150240 Extent end (trk no) : 491384 Compatible Disk Layout : yes Blocksize : 4096 Mode : Expand Type "yes" to continue, no will leave the disk untouched: yes Formatting the device. This may take a while (get yourself a coffee). Finished formatting the device. Rereading the partition table... ok Thu 28 Jun 21:05:40 UTC [root@sl55zdump] ~ #fdasd /dev/dasdr reading volume label ..: VOL1 reading vtoc ..........: ok WARNING: This device is not fully formatted! Only 10016 of 32759 cylinders are available. ---------------------------------------------------------------------- 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/
