What I'm trying to ask you, is to only use chzdev. No echos. No chccwdev. As both echo & chccwdev are redundant if one uses chzdev.
chzdev can online the devices, and make that persistent, and wait for udev to settle. Doing all three actions in one go. E.g. $ sudo chzdev -e 0199 The -p flag forces chzdev to skip bringing the device online, and only modify the persistent configuration... Yet from your goals you appear to want to both online it & make that persistent. root@JUUB16MS:~# /sbin/dasdfmt -b 4096 -d cdl -f /dev/disk/by-path/ccw-0.0.019a -y /sbin/dasdfmt: Unable to open device /dev/disk/by-path/ccw-0.0.019a: No such device This suggests that device is offline. Has the following command been run?: $ sudo chzdev -e 019a on device 198 and 199 the output is different: /sbin/dasdfmt -b 4096 -d cdl -f /dev/disk/by-path/ccw-0.0.0199 -y Disk in use! Digging further into the sosreport data. The behavior above is expected, as there are physical LVM volumes in use on 199-part1 and 198-part2. Note that upon bringing devices online, the physical volumes, logical groups and volumes are automatically activated. One should use vgchange / vgreduce to deactivate relevant volume groups and make sure that physical volumes on 199-part1 & 198-part2 are not in activate use by active volume groups before reformatting. Please note, in addition to LVM, mdadm software RAID, btrfs and zfs can make devices become in use upon bringing them up online as well thanks to systemd-udevd and/or monitoring agents. S: disk/by-path/ccw-0.0.0199-part1 E: DEVLINKS=/dev/disk/by-id/ccw-IBM.750000000XG921.9241.00-part1 /dev/disk/by-id/ccw-IBM.750000000XG921.9241.00.0000181d000018540000000000000000-part1 /dev/disk/by-id/ccw-0X0199-part1 /dev/disk/by-path/ccw-0.0.0199-part1 /dev/disk/by-id/lvm-pv-uuid-LgRz3a-6rkf-xZt3-FoHb-wCcG-XqgL-clWlWD E: DEVNAME=/dev/dasdh1 E: DEVPATH=/devices/css0/0.0.0011/0.0.0199/block/dasdh/dasdh1 E: DEVTYPE=partition E: ID_BUS=ccw E: ID_FS_TYPE=LVM2_member E: ID_FS_USAGE=raid E: ID_FS_UUID=LgRz3a-6rkf-xZt3-FoHb-wCcG-XqgL-clWlWD E: ID_FS_UUID_ENC=LgRz3a-6rkf-xZt3-FoHb-wCcG-XqgL-clWlWD E: ID_FS_VERSION=LVM2 001 S: disk/by-path/ccw-0.0.0198-part2 E: DEVLINKS=/dev/disk/by-id/ccw-IBM.750000000XG921.9241.00.0000854400008ae60000000000000000-part2 /dev/disk/by-id/ccw-0X0192-part2 /dev/disk/by-id/lvm-pv-uuid-b2Bob7-Evkm-BJTc-S4m3-Xc2E-Lmbu-u9XHhk /dev/disk/by-id/ccw-IBM.750000000XG921.9241.00-part2 /dev/disk/by-path/ccw-0.0.0198-part2 E: DEVNAME=/dev/dasdg2 E: DEVPATH=/devices/css0/0.0.0010/0.0.0198/block/dasdg/dasdg2 E: DEVTYPE=partition E: ID_BUS=ccw E: ID_FS_TYPE=LVM2_member E: ID_FS_USAGE=raid E: ID_FS_UUID=b2Bob7-Evkm-BJTc-S4m3-Xc2E-Lmbu-u9XHhk E: ID_FS_UUID_ENC=b2Bob7-Evkm-BJTc-S4m3-Xc2E-Lmbu-u9XHhk E: ID_FS_VERSION=LVM2 001 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1643527 Title: dasdfmt fails after vary online. syslog show strange message "The disk layout of the DASD is not supported" To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-z-systems/+bug/1643527/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
