Comment 2 for bug 1589526

Are you trying to (a) install ubuntu onto multipath device as root file system or (b) post-install, add and activate a multipath zhcp device for arbitrary data storage?

Reading the installer logs, I see following observations.

The installation was not performed onto a multipath device.

It is recommended to use the installer, and install onto multipath device directly, if that is desired. The installation was performed onto a ECKD dasd drive 0192.

Typically, one is presented with the zhcp screen to activate zhcp devices, and then choose an assembled multipath device, at install time. Then it is correctly setup, in fstab, in the initramfs, in zipl.conf and the generated bootmap with zipl.

See following:
May 11 05:54:40 kernel: [ 153.539344] dasd-eckd 0.0.0192: A channel path to the device has become operational
May 11 05:54:40 kernel: [ 153.541193] dasd-eckd 0.0.0192: New DASD 3390/0C (CU 3990/01) with 2885 cylinders, 15 heads, 224 sectors
May 11 05:54:40 kernel: [ 153.554997] dasd-eckd 0.0.0192: DASD with 4 KB/block, 2077200 KB total size, 48 KB/track, compatible disk layout
May 11 05:54:40 kernel: [ 153.561502] dasda:VOL1/ 0X0192: dasda1 dasda2 dasda3
May 11 05:54:43 s390-dasd[5459]: Printing hashmark every 10 cylinders.
May 11 05:54:43 s390-dasd[5459]:
May 11 05:55:08 kernel: [ 180.968672] dasd-eckd 0.0.0192: DASD with 4 KB/block, 2077200 KB total size, 48 KB/track, compatible disk layout
May 11 05:55:08 kernel: [ 180.968678] dasda: detected capacity change from 0 to 2127052800
May 11 05:55:09 s390-dasd[5459]:
May 11 05:55:09 s390-dasd[5459]:
May 11 05:55:09 s390-dasd[5459]: Finished formatting the device.
May 11 05:55:09 s390-dasd[5459]: Rereading the partition table... ok
May 11 05:55:09 kernel: [ 180.969253] dasda:
May 11 05:55:09 kernel: [ 182.258534] dasda:VOL1/ LX0192:
May 11 05:55:30 main-menu[361]: INFO: Menu item 's390-zfcp' selected
May 11 05:55:30 net/hw-detect.hotplug: Detected hotpluggable network interface enc900
May 11 05:55:30 net/hw-detect.hotplug: Detected hotpluggable network interface lo
May 11 05:55:30 s390-zfcp[5490]: DEBUG: DETECT: The zfcp device driver is not loaded
May 11 05:55:30 s390-zfcp[5490]: WARNING **: Could not open directory: /sys/bus/ccw/drivers/zfcp/: No such file or directory
May 11 05:55:31 main-menu[361]: INFO: Menu item 'disk-detect' selected
May 11 05:55:31 anna-install: Installing mmc-modules
May 11 05:55:31 disk-detect: insmod /lib/modules/4.4.0-21-generic/kernel/drivers/scsi/device_handler/scsi_dh_rdac.ko
May 11 05:55:31 kernel: [ 203.950555] rdac: device handler registered
May 11 05:55:31 kernel: [ 203.953114] alua: device handler registered
May 11 05:55:31 disk-detect: insmod /lib/modules/4.4.0-21-generic/kernel/drivers/scsi/device_handler/scsi_dh_alua.ko
May 11 05:55:31 disk-detect: insmod /lib/modules/4.4.0-21-generic/kernel/drivers/scsi/device_handler/scsi_dh_hp_sw.ko
May 11 05:55:31 disk-detect: insmod /lib/modules/4.4.0-21-generic/kernel/drivers/scsi/device_handler/scsi_dh_emc.ko
May 11 05:55:31 kernel: [ 203.955593] hp_sw: device handler registered
May 11 05:55:31 kernel: [ 203.958012] emc: device handler registered