The shutdown plan requires that the config for a device being cleared to
not include the preserve: True config. The "raid" partition, vda3 is
explicitly marked as preserved: true:
- device: disk-vda
size: 20947402752
flag: linux
preserve: true
type: partition
id: partition-vda3
Curtin would not be able to clear raid metadata from this partition
without wipe: set and preserve not present.
That said, I do think that curtin can do a few things to resolve this:
1) include partial raids in the discovered config, and can either
a) add a field to indicate whether the array is healthy/partial/degrated;
array_state maybe
b) defer to subiquity to use curtin.block.mdadm.md_check to determine if it
wants to include or mark members of the array with wipe so they can be used in
other configs.
2) Update how we run clear-holders; Currently we only pass in a list of
block devices, of type disk which have 'wipe' set and do not have
'preserve' enabled. This fails the case here where we'd like to wipe
vda3 but it has a holder.
Concretely; I'd curtin discover would return:
- type: raid
level: 0
name: md127
devices:
- partition-vda3
spare_devices: []
array_state: failed
Now, to do that, probert will need to also include partial raids as
well. Not sure; it's odd that pyudev didn't have a /dev/md127 entry in
the context.
The alternative for probert is to run some mdadm commands on the devices
which have the ID_FSTYPE set to raid. I'll add a probert task for this
bug as well.
For clear-holders, curtin will also accept type: partition. I expect
the final config to set wipe: superblock on vda3 since it's a raid
member; and that clear-holders is called with devices=['/dev/vda3']
- device: disk-vda
size: 20947402752
flag: linux
wipe: superblock
type: partition
id: partition-vda3
>From there, clear-holders would find /dev/md127 has a holder of type:
raid and then the normal curtin shutdown plan would show us stopping
md127, wipe each array member (/dev/vda3).
** Also affects: probert (Ubuntu)
Importance: Undecided
Status: New
** Changed in: probert (Ubuntu)
Importance: Undecided => High
** Changed in: probert (Ubuntu)
Status: New => Triaged
** Changed in: curtin
Importance: Undecided => High
** Changed in: curtin
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/1835091
Title:
subiquity crashes upon reusing failed to assemble raid member
partition
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