It looks like there may be a hardware problem with the raid device that is stopping subiquity from wiping the device (although I think distinct from the above bug I linked):
Running command ['udevadm', 'settle'] with allowed return codes [0] (capture=False) TIMED udevadm_settle(): 0.006 /dev/md127 is multipath device partition? False /dev/md126 is multipath device partition? False /proc/mdstat: Personalities : [raid0] [raid1] [raid6] [raid5] [raid4] [raid10] md126 : inactive sda[0](S) 3096 blocks super external:imsm
md127 : inactive sdb[0](S) 2776 blocks super external:imsm
unused devices: <none>
Activating mdadm array /dev/md127 Running command ['mdadm', '--run', '/dev/md127'] with allowed return codes [0] (capture=True) MDADM run on /dev/md127 stdout:
stderr: mdadm: (IMSM): Unsupported attributes : 2000000 mdadm: Unsupported attributes in IMSM metadata.Arrays activation is blocked. mdadm: Cannot activate array /md127/1 in /dev/md/imsm0. mdadm: Cannot activate array /md127/0 in /dev/md/imsm0.
It looks like there may be a hardware problem with the raid device that is stopping subiquity from wiping the device (although I think distinct from the above bug I linked):
Running command ['udevadm', 'settle'] with allowed return codes [0] (capture=False)
TIMED udevadm_settle(): 0.006
/dev/md127 is multipath device partition? False
/dev/md126 is multipath device partition? False
/proc/mdstat:
Personalities : [raid0] [raid1] [raid6] [raid5] [raid4] [raid10]
md126 : inactive sda[0](S)
3096 blocks super external:imsm
md127 : inactive sdb[0](S)
2776 blocks super external:imsm
unused devices: <none>
Activating mdadm array /dev/md127
Running command ['mdadm', '--run', '/dev/md127'] with allowed return codes [0] (capture=True)
MDADM run on /dev/md127 stdout:
stderr:
mdadm: (IMSM): Unsupported attributes : 2000000
mdadm: Unsupported attributes in IMSM metadata.Arrays activation is blocked.
mdadm: Cannot activate array /md127/1 in /dev/md/imsm0.
mdadm: Cannot activate array /md127/0 in /dev/md/imsm0.