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Anon avatar Ubuntu

Unable to mount Raid 5 array "already mounted or mount point busy"

cn flag
Anon

I've been trying to google and search and can't seem to find an answer to my specific problem even though many people have posted similar issues. Here we go.

Trying to mount my raid 5 array to a folder /mnt/raid. Added to fstab:

UUID=202483d5-808d-9a85-5361-c119c4bdbda4 /mnt/raid ext4 defaults 0 2

Here's the blkid uuid output:

/dev/sdc: UUID="202483d5-808d-9a85-5361-c119c4bdbda4" UUID_SUB="9a17b921-7b72-8031-71de-8049fddda330" LABEL="homeserver:0" TYPE="linux_raid_member"
/dev/sdb: UUID="202483d5-808d-9a85-5361-c119c4bdbda4" UUID_SUB="501b9b14-5c17-f798-78a5-dbd9afdeaba3" LABEL="homeserver:0" TYPE="linux_raid_member"
/dev/sde: UUID="202483d5-808d-9a85-5361-c119c4bdbda4" UUID_SUB="bafc7cbe-294d-70a5-10fa-8b4412c3a2b9" LABEL="homeserver:0" TYPE="linux_raid_member"
/dev/sdd: UUID="202483d5-808d-9a85-5361-c119c4bdbda4" UUID_SUB="76ad59f4-aa6e-1cde-2026-3077310841f8" LABEL="homeserver:0" TYPE="linux_raid_member"

Here's the error I get:

sudo mount /mnt/raid
mount: /mnt/raid: /dev/sdb already mounted or mount point busy.

Tried a different command but still no dice:

sudo mount -t ext4 /dev/md0 /mnt/raid
mount: /mnt/raid: wrong fs type, bad option, bad superblock on /dev/md0, missing codepage or helper program, or other error.

Raid Detail:

sudo mdadm --detail /dev/md0
/dev/md0:
           Version : 1.2
     Creation Time : Wed Nov 24 05:49:18 2021
        Raid Level : raid5
        Array Size : 23441682432 (22355.73 GiB 24004.28 GB)
     Used Dev Size : 7813894144 (7451.91 GiB 8001.43 GB)
      Raid Devices : 4
     Total Devices : 4
       Persistence : Superblock is persistent

     Intent Bitmap : Internal

       Update Time : Fri Nov 26 02:22:04 2021
             State : clean
    Active Devices : 4
   Working Devices : 4
    Failed Devices : 0
     Spare Devices : 0

            Layout : left-symmetric
        Chunk Size : 512K

Consistency Policy : bitmap

              Name : homeserver:0  (local to host homeserver)
              UUID : 202483d5:808d9a85:5361c119:c4bdbda4
            Events : 9306

    Number   Major   Minor   RaidDevice State
       0       8       16        0      active sync   /dev/sdb
       1       8       32        1      active sync   /dev/sdc
       2       8       48        2      active sync   /dev/sdd
       4       8       64        3      active sync   /dev/sde

Weird part is that dmraid comes up with nothing:

sudo dmraid -r
no raid disks

I checked smart status on each disk, just in case it was a bad drive, and they all pass.

I don't think this is an lvm (unless I'm missing something). I've scoured the internet and can't seem to find an answer. Any suggestions on how I might do this? I can't seem to figure out what I'm missing.

Running Ubuntu Server 20.04.03LTS

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Anon avatar Ubuntu
cn flag
Anon

I found the answer to my question. Basically I didn't have the mdadm .conf file updated with md0. md0 also did not have a superblock even though each hard drive did. So I formatted md0 as ext4, added md0 to the mdadm .conf file and then updated fstab with the new uuid. This solved the problem.

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