Диск в RAID1 на CentOS

Добрый день.

Помогите, кто может.
Был RAID1 из двух одинаковых дисков, в 2020 году развалился, а никто и не заметил.
Вся работа велась с sda, а не с md127.
Сегодня несколько раз дернули питание, что-то случилось с sda, система загрузилась с sdb, а данные-то там датированы летом 2020...
Взгляните вывод нескольких команд, пожалуйста. Вот что могло случиться?

[console]
root@samba /var/log # lsscsi
[0:0:0:0] disk ATA ST1000NM0011 PA03 /dev/sda
[1:0:0:0] disk ATA ST1000NM0011 PA03 /dev/sdb
[2:0:0:0] cd/dvd TSSTcorp DVD+-RW TS-L633J D150 /dev/sr0

root@samba /var/log # lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda 8:0 0 3,9G 0 disk
sdb 8:16 0 931,5G 0 disk
├─sdb1 8:17 0 16G 0 part
├─sdb2 8:18 0 501M 0 part
│ └─md125 9:125 0 501M 0 raid1 /boot
└─sdb3 8:19 0 915G 0 part
└─md127 9:127 0 914,9G 0 raid1 /
sr0 11:0 1 1024M 0 rom

root@samba /var/log # cat /proc/mdstat
Personalities : [raid1]
md125 : active raid1 sdb2[0]
512960 blocks super 1.0 [2/1] [U_]
bitmap: 1/1 pages [4KB], 65536KB chunk

md126 : inactive sdb1[0](S)
16777216 blocks super 1.2

md127 : active raid1 sdb3[0]
959323136 blocks super 1.2 [2/1] [U_]
bitmap: 8/8 pages [32KB], 65536KB chunk

unused devices: <none>

root@samba /var/log # mdadm -D /dev/md127
/dev/md127:
Version : 1.2
Creation Time : Wed Nov 30 15:10:53 2016
Raid Level : raid1
Array Size : 959323136 (914.88 GiB 982.35 GB)
Used Dev Size : 959323136 (914.88 GiB 982.35 GB)
Raid Devices : 2
Total Devices : 1
Persistence : Superblock is persistent

Intent Bitmap : Internal

Update Time : Fri Oct 14 21:34:05 2022
State : clean, degraded
Active Devices : 1
Working Devices : 1
Failed Devices : 0
Spare Devices : 0

Consistency Policy : bitmap

Name : samba:root
UUID : e2bbe82a:ed13a2b7:89987763:aa2651d7
Events : 540128

Number Major Minor RaidDevice State
0 8 19 0 active sync /dev/sdb3
- 0 0 1 removed
root@samba /var/log #


root@samba /var/log # smartctl -a /dev/sda
smartctl 7.0 2018-12-30 r4883 [x86_64-linux-3.10.0-693.5.2.el7.x86_64] (local build)
Copyright (C) 2002-18, Bruce Allen, Christian Franke, www.smartmontools.org

=== START OF INFORMATION SECTION ===
Model Family: Seagate Constellation ES (SATA 6Gb/s)
Device Model: ST1000NM0011
Serial Number: Z1N0KBMT
LU WWN Device Id: 5 000c50 03f63100f
Add. Product Id: DELL(tm)
Firmware Version: PA03
User Capacity: 137 438 952 960 bytes [137 GB]
Sector Size: 512 bytes logical/physical
Rotation Rate: 7200 rpm
Device is: In smartctl database [for details use: -P show]
ATA Version is: ATA8-ACS T13/1699-D revision 4
SATA Version is: SATA 3.0, 6.0 Gb/s
Local Time is: Fri Oct 14 21:53:43 2022 MSK
SMART support is: Available - device has SMART capability.
SMART support is: Enabled

Read SMART Data failed: scsi error badly formed scsi parameters

=== START OF READ SMART DATA SECTION ===
SMART Status command failed: scsi error badly formed scsi parameters
SMART overall-health self-assessment test result: UNKNOWN!
SMART Status, Attributes and Thresholds cannot be read.

Read SMART Log Directory failed: scsi error badly formed scsi parameters

Read SMART Error Log failed: scsi error badly formed scsi parameters

Read SMART Self-test Log failed: scsi error badly formed scsi parameters

Selective Self-tests/Logging not supported

root@samba /var/log #
[/console]


[console][ 3.510602] sd 0:0:0:0: [sda] FAILED Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
[ 3.510606] sd 0:0:0:0: [sda] Sense Key : Illegal Request [current] [descriptor].
[ 3.510609] sd 0:0:0:0: [sda] Add. Sense: Unaligned write command
[ 3.510613] sd 0:0:0:0: [sda] CDB: Read(10) 28 00 00 00 00 00 00 00 02 00
[ 3.510615] blk_update_request: I/O error, dev sda, sector 0
[ 3.511623] Buffer I/O error on dev sda, logical block 0, async page read
[/console]
Добавлено: 14.10.2022 23:39:20

И HDD видится как 4GB, а не 1TB...

[console]Oct 14 17:41:27 samba kernel: sd 0:0:0:0: [sda] 8089950 512-byte logical blocks: (4.14 GB/3.85 GiB)
Oct 14 17:41:27 samba kernel: sd 0:0:0:0: [sda] Write Protect is off
Oct 14 17:41:27 samba kernel: sd 0:0:0:0: [sda] Write cache: enabled, read cache: enabled, doesn't suppo
rt DPO or FUA
Oct 14 17:41:27 samba kernel: sd 1:0:0:0: [sdb] 1953525168 512-byte logical blocks: (1.00 TB/931 GiB)
Oct 14 17:41:27 samba kernel: sd 1:0:0:0: [sdb] Write Protect is off
Oct 14 17:41:27 samba kernel: sd 1:0:0:0: [sdb] Write cache: enabled, read cache: enabled, doesn't suppo
rt DPO or FUA
[/console]