Re: Recovering RAID-1

[H <agents@meddatainc.com>]

On 06/14/2021 04:17 AM, antlists wrote:
> On 13/06/2021 23:51, H wrote:
>> I would very much appreciate if anyone can suggest how to check the last items? Once this has been verified the next step would be to get mdadm RAID-1 going again.
>
> An obvious first step is to run lsdrv. https://raid.wiki.kernel.org/index.php/Asking_for_help
>
> That will hopefully find anything there.
>
> But before you do anything BACKUP BACKUP BACKUP. It's only 250GB from what I can see - getting your hands on a 500GB or 1TB drive shouldn't be hard, and a quick stream of the partition shouldn't take long (although a "cp -a" might be safer, given that LUKS is involved ...).
>
> Cheers,
> Wol

Thank you for the link, here is the output from the various packages listed on that page:

uname -a

Linux tsp520c 3.10.0-1160.2.2.el7.x86_64 #1 SMP Tue Oct 20 16:53:08 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux

mdadm --version

mdadm - v4.1 - 2018-10-01

smartctl --xall /dev...

I skipped this since the output is lengthy and not sure which parts we might need.

mdadm --examine /dev/sdb (and /dev/sdc as well as individual partitions)

[root@tsp520c ~]# mdadm --examine /dev/sdb
/dev/sdb:
   MBR Magic : aa55
Partition[0] :    500118191 sectors at            1 (type ee)
[root@tsp520c ~]# mdadm --examine /dev/sdb1
/dev/sdb1:
   MBR Magic : aa55
Partition[0] :   1701978223 sectors at   1948285285 (type 6e)
Partition[3] :          441 sectors at     28049408 (type 00)
[root@tsp520c ~]# mdadm --examine /dev/sdb2
mdadm: No md superblock detected on /dev/sdb2.
[root@tsp520c ~]# mdadm --examine /dev/sdb3
mdadm: No md superblock detected on /dev/sdb3.
[root@tsp520c ~]#

[root@tsp520c ~]# mdadm --examine /dev/sdc
/dev/sdc:
   MBR Magic : aa55
Partition[0] :    500118191 sectors at            1 (type ee)
[root@tsp520c ~]# mdadm --examine /dev/sdc1
/dev/sdc1:
   MBR Magic : aa55
Partition[0] :   1701978223 sectors at   1948285285 (type 6e)
Partition[3] :          441 sectors at     28049408 (type 00)
[root@tsp520c ~]# mdadm --examine /dev/sdc2
mdadm: No md superblock detected on /dev/sdc2.
[root@tsp520c ~]# mdadm --examine /dev/sdc3
mdadm: No md superblock detected on /dev/sdc3.

cat /proc/mdstat

Personalities :
unused devices: <none>

mdadm --detail /dev/mdx

There are no /dev/md devices

lsdrv

**Warning** The following utility(ies) failed to execute:
  sginfo
Some information may be missing.

USB [uas] Bus 002 Device 002: ID 0bc2:231a Seagate RSS LLC Expansion Portable {NAADA87P}
└scsi 0:0:0:0 Seagate  Expansion      
 └sda 3.64t [8:0] crypto_LUKS {f573965d-f469-4fc2-abf6-8155f7f422c4}
  └dm-4 3.64t [253:4] ext4 {3a94f5a0-058a-4002-9067-27ed211e99f0}
   └Mounted as /dev/mapper/luks-f573965d-f469-4fc2-abf6-8155f7f422c4 @ /run/media/hakan/3a94f5a0-058a-4002-9067-27ed211e99f0
PCI [ahci] 00:17.0 SATA controller: Intel Corporation 200 Series PCH SATA controller [AHCI mode]
├scsi 1:0:0:0 ATA      SAMSUNG MZ7LH256 {S4VSNE0MA03154}
│└sdb 238.47g [8:16] Partitioned (gpt)
│ ├sdb1 260.00m [8:17] vfat 'SYSTEM' {A850-134B}
│ ├sdb2 1.00g [8:18] xfs {2d8a56bf-f1e3-4f02-9ae7-3a20c987586d}
│ └sdb3 237.22g [8:19] crypto_LUKS {8fb015aa-50d8-49b5-9001-964e3247fc87}
│  └dm-0 237.21g [253:0] PV LVM2_member <237.21g used, 4.00m free {K082KU-HZAr-i6Np-9TwL-av7Z-Nytm-4I4jHe}
│   └VG centos_tsp520c 237.21g 4.00m free {Y4mpA3-tMd8-L5Pg-xYQF-lcQY-7wgk-Ox2iSi}
│    ├dm-3 179.52g [253:3] LV home xfs {1d7fabc3-c6f5-4e43-b609-ea86d33012c1}
│    │└Mounted as /dev/mapper/centos_tsp520c-home @ /home
│    ├dm-1 50.00g [253:1] LV root xfs {f4f1de82-b53d-4d6d-81f0-621103dddec5}
│    │└Mounted as /dev/mapper/centos_tsp520c-root @ /
│    └dm-2 7.69g [253:2] LV swap swap {7fbb4125-6394-4fe8-83a1-8ff0e079ae98}
├scsi 2:0:0:0 ATA      SAMSUNG MZ7LH256 {S4VSNE0MA03145}
│└sdc 238.47g [8:32] Partitioned (gpt)
│ ├sdc1 260.00m [8:33] vfat 'SYSTEM' {A850-134B}
│ │└Mounted as /dev/sdc1 @ /boot/efi
│ ├sdc2 1.00g [8:34] xfs {2d8a56bf-f1e3-4f02-9ae7-3a20c987586d}
│ │└Mounted as /dev/sdc2 @ /boot
│ └sdc3 237.22g [8:35] crypto_LUKS {8fb015aa-50d8-49b5-9001-964e3247fc87}
└scsi 7:0:0:0 ATA      Samsung SSD 860  {S597NE0MA20991N}
 └sdd 1.82t [8:48] Partitioned (gpt)
  ├sdd1 1.82t [8:49] zfs_member 'zfspool' {3888980096123243448}
  └sdd9 8.00m [8:57] Empty/Unknown
Other Block Devices
└loop0 0.00k [7:0] Empty/Unknown

Note that there are two other disks in the system which are not relevant (sda and sdd). The two identical SSDs, SAMSUNG MZ7LH256, are the ones that should be configured RAID-1 (sdb and sdc).

Thank you.