Unable to Mount RAID1 md0 - wrong fs type, bad option, bad superblock on /dev/md0, missing codepage or helper program, or other error

mdadm partitioning mount hard-drive raid

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You have to make a file system on your array. The raw array is just a block device, which can hold any kind of file system, or non file system data.

To make a filesystem, you can issue sudo mkfs.ext4 /dev/md0 to make a new filesystem with EXT4 (one of the more popular file systems; works great for all round use.

After you've made a file system you can mount it using the command sudo mount /dev/md0 /home/ste/mnt/

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spcurtis81

So, to be fair, I'm a novice with a considerable appetite for gaining new skills and knowledge. I am an advocate of making people's work and play experiences easier, more efficient and enjoyable through the use of technology and software. This interest is my main drive for understanding more about the way software works and how it can be molded to support a user's needs thus improving their day to day experience. Most commonly in my work environment, I use Microsoft Access and more recently I have been starting to use more VBA code and have been expanding my ability to automate and change the way colleagues access and experience date within our business; this is one of my main interests for learning and development. In considerable contrast, my other interest has been through beginning to develop iOS apps through Apple's Xcode tool. Both are areas I am seeking to gain and hopefully with time share advice and experience. Oh... and I might want to learn about Bash code.

Updated on September 18, 2022

Comments

spcurtis81 over 1 year

I've created a RAID 1 using mdadm as below however I am having problems mounting it...

sudo mdadm --create --verbose /dev/md0 --level=1 --raid-devices=2 /dev/sdb /dev/sdc
mdadm: /dev/sdb appears to be part of a raid array:
       level=raid1 devices=2 ctime=Sun Nov  5 20:36:10 2017
mdadm: Note: this array has metadata at the start and
    may not be suitable as a boot device.  If you plan to
    store '/boot' on this device please ensure that
    your boot-loader understands md/v1.x metadata, or use
    --metadata=0.90
mdadm: size set to 625000768K
mdadm: automatically enabling write-intent bitmap on large array
Continue creating array? yes
mdadm: Defaulting to version 1.2 metadata
mdadm: array /dev/md0 started.

sudo mdadm --examine --scan --config=/etc/mdadm/mdadm.conf
ARRAY /dev/md/0  metadata=1.2 UUID=1e236272:3e68ea7b:fab6ba77:eb211675 name=SPCURTIS81-projSERV:0

However when I try to mount the array, I'm getting the following error...

sudo mount /dev/md0 /home/ste/mnt/
mount: /home/ste/mnt: wrong fs type, bad option, bad superblock on /dev/md0, missing codepage or helper program, or other error.

I've Google'd and searched on here but I'm struggling to find anything which I understand to relate directly to this.

Some of the following info may or may not however be of use...

lsblk

NAME           MAJ:MIN RM   SIZE RO TYPE  MOUNTPOINT
sda              8:0    0 465.8G  0 disk
├─sda1           8:1    0  18.6G  0 part  /
├─sda2           8:2    0     1K  0 part
├─sda5           8:5    0 442.4G  0 part  /home
└─sda6           8:6    0   4.8G  0 part
  └─cryptswap1 253:0    0   4.8G  0 crypt
sdb              8:16   0 596.2G  0 disk
└─md0            9:0    0   596G  0 raid1
sdc              8:32   0 596.2G  0 disk
└─md0            9:0    0   596G  0 raid1

fsck Same result for both sdb & sdc - fsck from util-linux 2.30.1

cat /proc/mdstat

Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10]
md0 : active raid1 sdc[1] sdb[0]
      625000768 blocks super 1.2 [2/2] [UU]
      [===>.................]  resync = 18.5% (116140608/625000768) finish=78.1min speed=108513K/sec
      bitmap: 5/5 pages [20KB], 65536KB chunk