[Bug 1990237] Re: [VROC] Error occurs during installation OS on degraded RAID volume

[Kinga Tanska]

Hello,

Thanks for information. If I understand correctly, this issue will be
fixed, right?

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Title:
  [VROC] Error occurs during installation OS on degraded RAID volume

Status in subiquity:
  Triaged

Bug description:
  Found on Ubuntu 22.04.1

  Steps to reproduce:
  1. Create RAID in preOS.
  2. Disconnect RAID member to degrade volume.
  3. Reboot.
  4. Prepare install configuration file and set installation on GPT partition.
  5. Start OS installation on degraded RAID volume using configuration file.
  6. Wait for installation to finish.

  Expected results:
  OS should be installed successfully.
  OS should boot from degraded RAID.

  Actual results:
  It's not possible to install OS on degraded RAID:

  Running command ['mdadm', '--detail', '--scan', '-v'] with allowed return codes [0, 1] (capture=True)
          mdadm detail scan after assemble:
          ARRAY /dev/md/imsm0 level=container num-devices=3 metadata=imsm UUID=96c463f3:804edb63:c033cafe:cf718802
             devices=/dev/sda,/dev/sdf,/dev/sdg
          ARRAY /dev/md/r5d4s16_A_0 level=raid5 num-devices=4 container=/dev/md/imsm0 member=0 UUID=86eae79c:0fdb9874:7e3361e3:9bb16ea2
             devices=/dev/sda,/dev/sdf,/dev/sdg
          
          
          Running command ['udevadm', 'settle'] with allowed return codes [0] (capture=False)
          TIMED udevadm_settle(): 0.021
          RAID validation: name=/dev/md126 raidlevel=raid5 devices=[] spares=[] container=/dev/md127
          Running command ['mdadm', '--query', '--detail', '--export', '/dev/md126'] with allowed return codes [0] (capture=True)
          Verified /dev/md126 raid composition, raid is not OK
          Error checking raid /dev/md126: Array in degraded state: /dev/md126
          Error checking raid /dev/md126: Array in degraded state: /dev/md126
          An error occured handling 'volume': ValueError - Verified /dev/md126 raid composition, raid is not OK
          finish: cmd-install/stage-partitioning/builtin/cmd-block-meta: FAIL: configuring raid: volume
          TIMED BLOCK_META: 1.912
          finish: cmd-install/stage-partitioning/builtin/cmd-block-meta: FAIL: curtin command block-meta
          Traceback (most recent call last):
            File "/snap/subiquity/3698/lib/python3.8/site-packages/curtin/commands/main.py", line 202, in main
              ret = args.func(args)
            File "/snap/subiquity/3698/lib/python3.8/site-packages/curtin/log.py", line 97, in wrapper
              return log_time("TIMED %s: " % msg, func, *args, **kwargs)
            File "/snap/subiquity/3698/lib/python3.8/site-packages/curtin/log.py", line 79, in log_time
              return func(*args, **kwargs)
            File "/snap/subiquity/3698/lib/python3.8/site-packages/curtin/commands/block_meta.py", line 117, in block_meta
              return meta_custom(args)
            File "/snap/subiquity/3698/lib/python3.8/site-packages/curtin/commands/block_meta.py", line 2045, in meta_custom
              handler(command, storage_config_dict, command_handlers)
            File "/snap/subiquity/3698/lib/python3.8/site-packages/curtin/commands/block_meta.py", line 1626, in raid_handler
              raid_verify(
            File "/snap/subiquity/3698/lib/python3.8/site-packages/curtin/commands/block_meta.py", line 1582, in raid_verify
              verify_md_components(
            File "/snap/subiquity/3698/lib/python3.8/site-packages/curtin/commands/block_meta.py", line 1578, in verify_md_components
              raise ValueError(msg)
          ValueError: Verified /dev/md126 raid composition, raid is not OK
          Verified /dev/md126 raid composition, raid is not OK

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