RAID 5再構成プロセス（ドライブ4台からドライブ5台）を実行していました。
mdadm --examine /dev/sd[abcdi]
/dev/sda:
Magic : a92b4efc
Version : 1.2
Feature Map : 0x45
Array UUID : 7b55730e:002db9a2:e79a9acc:ee95da88
Name : AlienNAS:1
Creation Time : Mon Jun 14 22:06:14 2021
Raid Level : raid5
Raid Devices : 5
Avail Dev Size : 11720780976 (5588.90 GiB 6001.04 GB)
Array Size : 23441561600 (22355.62 GiB 24004.16 GB)
Used Dev Size : 11720780800 (5588.90 GiB 6001.04 GB)
Data Offset : 264192 sectors
New Offset : 260096 sectors
Super Offset : 8 sectors
State : clean
Device UUID : b1af3662:e6d41207:08fd222b:bfe10074
Internal Bitmap : 8 sectors from superblock
Reshape pos'n : 11643189248 (11103.81 GiB 11922.63 GB)
Delta Devices : 1 (4->5)
Update Time : Sun Jan 15 10:09:13 2023
Bad Block Log : 512 entries available at offset 32 sectors
Checksum : 16afeaeb - correct
Events : 22037
Layout : left-symmetric
Chunk Size : 512K
Device Role : Active device 2
Array State : AAAA. ('A' == active, '.' == missing, 'R' == replacing)
/dev/sdb:
Magic : a92b4efc
Version : 1.2
Feature Map : 0x45
Array UUID : 7b55730e:002db9a2:e79a9acc:ee95da88
Name : AlienNAS:1
Creation Time : Mon Jun 14 22:06:14 2021
Raid Level : raid5
Raid Devices : 5
Avail Dev Size : 11720780976 (5588.90 GiB 6001.04 GB)
Array Size : 23441561600 (22355.62 GiB 24004.16 GB)
Used Dev Size : 11720780800 (5588.90 GiB 6001.04 GB)
Data Offset : 264192 sectors
New Offset : 260096 sectors
Super Offset : 8 sectors
State : clean
Device UUID : dc6f6b93:ca24c965:6773fc72:1b9b36c5
Internal Bitmap : 8 sectors from superblock
Reshape pos'n : 11646240768 (11106.72 GiB 11925.75 GB)
Delta Devices : 1 (4->5)
Update Time : Sun Jan 15 10:10:58 2023
Bad Block Log : 512 entries available at offset 32 sectors
Checksum : 40074b23 - correct
Events : 22042
Layout : left-symmetric
Chunk Size : 512K
Device Role : Active device 1
Array State : AAAA. ('A' == active, '.' == missing, 'R' == replacing)
/dev/sdc:
Magic : a92b4efc
Version : 1.2
Feature Map : 0x45
Array UUID : 7b55730e:002db9a2:e79a9acc:ee95da88
Name : AlienNAS:1
Creation Time : Mon Jun 14 22:06:14 2021
Raid Level : raid5
Raid Devices : 5
Avail Dev Size : 11720780976 (5588.90 GiB 6001.04 GB)
Array Size : 23441561600 (22355.62 GiB 24004.16 GB)
Used Dev Size : 11720780800 (5588.90 GiB 6001.04 GB)
Data Offset : 264192 sectors
New Offset : 260096 sectors
Super Offset : 8 sectors
State : clean
Device UUID : ec41cd88:9f0af810:fb4d44f0:8df26665
Internal Bitmap : 8 sectors from superblock
Reshape pos'n : 11644702720 (11105.25 GiB 11924.18 GB)
Delta Devices : 1 (4->5)
Update Time : Sun Jan 15 10:10:47 2023
Bad Block Log : 512 entries available at offset 32 sectors
Checksum : fde14504 - correct
Events : 22041
Layout : left-symmetric
Chunk Size : 512K
Device Role : Active device 3
Array State : AAAA. ('A' == active, '.' == missing, 'R' == replacing)
/dev/sdd:
Magic : a92b4efc
Version : 1.2
Feature Map : 0x45
Array UUID : 7b55730e:002db9a2:e79a9acc:ee95da88
Name : AlienNAS:1
Creation Time : Mon Jun 14 22:06:14 2021
Raid Level : raid5
Raid Devices : 5
Avail Dev Size : 11720780976 (5588.90 GiB 6001.04 GB)
Array Size : 23441561600 (22355.62 GiB 24004.16 GB)
Used Dev Size : 11720780800 (5588.90 GiB 6001.04 GB)
Data Offset : 264192 sectors
New Offset : 260096 sectors
Super Offset : 8 sectors
State : clean
Device UUID : ff953142:14667e54:d725d785:05b0ee8b
Internal Bitmap : 8 sectors from superblock
Reshape pos'n : 11644702720 (11105.25 GiB 11924.18 GB)
Delta Devices : 1 (4->5)
Update Time : Sun Jan 15 10:10:58 2023
Bad Block Log : 512 entries available at offset 32 sectors
Checksum : b6e689e8 - correct
Events : 22042
Layout : left-symmetric
Chunk Size : 512K
Device Role : Active device 0
Array State : AAAA. ('A' == active, '.' == missing, 'R' == replacing)
/dev/sde:
Magic : a92b4efc
Version : 1.2
Feature Map : 0x1
Array UUID : f9685831:a8225d4c:49ce6aca:2b49612c
Name : AlienNAS:1
Creation Time : Thu Jun 17 07:21:06 2021
Raid Level : raid5
Raid Devices : 5
Avail Dev Size : 5860273072 (2794.40 GiB 3000.46 GB)
Array Size : 11720536064 (11177.57 GiB 12001.83 GB)
Used Dev Size : 5860268032 (2794.39 GiB 3000.46 GB)
Data Offset : 260096 sectors
Super Offset : 8 sectors
Unused Space : before=260016 sectors, after=5040 sectors
State : clean
Device UUID : 76e063b8:ebb80d30:86c69755:629376e0
Internal Bitmap : 8 sectors from superblock
Update Time : Sun Jan 15 10:59:08 2023
Bad Block Log : 512 entries available at offset 24 sectors
Checksum : e93f4335 - correct
Events : 17214
Layout : left-symmetric
Chunk Size : 512K
Device Role : Active device 3
Array State : AAAAA ('A' == active, '.' == missing, 'R' == replacing)
/dev/sdi:
Magic : a92b4efc
Version : 1.2
Feature Map : 0x45
Array UUID : 7b55730e:002db9a2:e79a9acc:ee95da88
Name : AlienNAS:1
Creation Time : Mon Jun 14 22:06:14 2021
Raid Level : raid5
Raid Devices : 5
Avail Dev Size : 11720780976 (5588.90 GiB 6001.04 GB)
Array Size : 23441561600 (22355.62 GiB 24004.16 GB)
Used Dev Size : 11720780800 (5588.90 GiB 6001.04 GB)
Data Offset : 264192 sectors
New Offset : 260096 sectors
Super Offset : 8 sectors
State : clean
Device UUID : df5806de:0f7ba1b5:4517d85d:96bc4de8
Internal Bitmap : 8 sectors from superblock
Reshape pos'n : 11646240768 (11106.72 GiB 11925.75 GB)
Delta Devices : 1 (4->5)
Update Time : Sun Jan 15 10:10:58 2023
Bad Block Log : 512 entries available at offset 32 sectors
Checksum : e86d4fc8 - correct
Events : 22042
Layout : left-symmetric
Chunk Size : 512K
Device Role : spare
Array State : AAAA. ('A' == active, '.' == missing, 'R' == replacing)
そして
mdadm --assemble --force /dev/md126 /dev/sda /dev/sdb /dev/sdc /dev/sdd /dev/sdi --verbose
mdadm: looking for devices for /dev/md126
mdadm: /dev/sda is identified as a member of /dev/md126, slot 2.
mdadm: /dev/sdb is identified as a member of /dev/md126, slot 1.
mdadm: /dev/sdc is identified as a member of /dev/md126, slot 3.
mdadm: /dev/sdd is identified as a member of /dev/md126, slot 0.
mdadm: /dev/sdi is identified as a member of /dev/md126, slot -1.
mdadm: added /dev/sdb to /dev/md126 as 1
mdadm: added /dev/sda to /dev/md126 as 2 (possibly out of date)
mdadm: added /dev/sdc to /dev/md126 as 3
mdadm: no uptodate device for slot 4 of /dev/md126
mdadm: added /dev/sdi to /dev/md126 as -1
mdadm: added /dev/sdd to /dev/md126 as 0
mdadm: /dev/md126 assembled from 3 drives and 1 spare - not enough to start the array.
そして
mdadm --detail /dev/md126
/dev/md126:
Version : 1.2
Raid Level : raid0
Total Devices : 5
Persistence : Superblock is persistent
State : inactive
Working Devices : 5
Delta Devices : 1, (-1->0)
New Level : raid5
New Layout : left-symmetric
New Chunksize : 512K
Name : AlienNAS:1
UUID : 7b55730e:002db9a2:e79a9acc:ee95da88
Events : 22041
Number Major Minor RaidDevice
- 8 32 - /dev/sdc
- 8 0 - /dev/sda
- 8 48 - /dev/sdd
- 8 16 - /dev/sdb
- 8 128 - /dev/sdi
そして
mdadm --add -v /dev/md126 /dev/sda
mdadm: Cannot get array info for /dev/md126
どんな助けでも本当に感謝します！ありがとうございます。