Issue mounting EXT2 FS

General support questions
Post Reply
dustinduse
Posts: 4
Joined: 2018/06/15 03:45:00

Issue mounting EXT2 FS

Post by dustinduse » 2018/06/15 03:50:21

I recently upgraded my server to a fresh install of CentOS7 from the latest version of 6. I reconfigured the raid just as it was previously and am now unable to mount it. Not sure what the issue is.

Code: Select all

[root@test ~]# fsck -N /dev/md0
fsck from util-linux 2.23.2
[/sbin/fsck.ext2 (1) -- /dev/md0] fsck.ext2 /dev/md0

Code: Select all

[root@test ~]# mdadm --detail /dev/md0
/dev/md0:
           Version : 1.2
     Creation Time : Wed Jun 13 23:34:48 2018
        Raid Level : raid1
        Array Size : 2930133440 (2794.39 GiB 3000.46 GB)
     Used Dev Size : 2930133440 (2794.39 GiB 3000.46 GB)
      Raid Devices : 2
     Total Devices : 2
       Persistence : Superblock is persistent

     Intent Bitmap : Internal

       Update Time : Thu Jun 14 07:02:25 2018
             State : clean
    Active Devices : 2
   Working Devices : 2
    Failed Devices : 0
     Spare Devices : 0

Consistency Policy : bitmap

              Name : test:0  (local to host test)
              UUID : 97be13eb:b9ffc14f:181a5634:333c58ca
            Events : 5375

    Number   Major   Minor   RaidDevice State
       0       8       17        0      active sync   /dev/sdb1
       1       8       33        1      active sync   /dev/sdc1

Code: Select all

[root@test ~]#  cat /proc/mdstat
Personalities : [raid1]
md0 : active raid1 sdb1[0] sdc1[1]
      2930133440 blocks super 1.2 [2/2] [UU]
      bitmap: 0/22 pages [0KB], 65536KB chunk

unused devices: <none>

Code: Select all

[root@test ~]# mount /dev/md0 /mnt/Storage -t ext2
mount: wrong fs type, bad option, bad superblock on /dev/md0,
       missing codepage or helper program, or other error

       In some cases useful info is found in syslog - try
       dmesg | tail or so.

Code: Select all

[root@test ~]# dmesg | tail
[97021.702768] EXT4-fs (md0): VFS: Can't find ext4 filesystem
Pulling out my hair here.

desertcat
Posts: 418
Joined: 2014/08/07 02:17:29
Location: Tucson, AZ

Re: Issue mounting EXT2 FS

Post by desertcat » 2018/06/16 04:32:12

dustinduse wrote:
2018/06/15 03:50:21
I recently upgraded my server to a fresh install of CentOS7 from the latest version of 6. I reconfigured the raid just as it was previously and am now unable to mount it. Not sure what the issue is.

Code: Select all

[root@test ~]# fsck -N /dev/md0
fsck from util-linux 2.23.2
[/sbin/fsck.ext2 (1) -- /dev/md0] fsck.ext2 /dev/md0

Code: Select all

[root@test ~]# mdadm --detail /dev/md0
/dev/md0:
           Version : 1.2
     Creation Time : Wed Jun 13 23:34:48 2018
        Raid Level : raid1
        Array Size : 2930133440 (2794.39 GiB 3000.46 GB)
     Used Dev Size : 2930133440 (2794.39 GiB 3000.46 GB)
      Raid Devices : 2
     Total Devices : 2
       Persistence : Superblock is persistent

     Intent Bitmap : Internal

       Update Time : Thu Jun 14 07:02:25 2018
             State : clean
    Active Devices : 2
   Working Devices : 2
    Failed Devices : 0
     Spare Devices : 0

Consistency Policy : bitmap

              Name : test:0  (local to host test)
              UUID : 97be13eb:b9ffc14f:181a5634:333c58ca
            Events : 5375

    Number   Major   Minor   RaidDevice State
       0       8       17        0      active sync   /dev/sdb1
       1       8       33        1      active sync   /dev/sdc1

Code: Select all

[root@test ~]#  cat /proc/mdstat
Personalities : [raid1]
md0 : active raid1 sdb1[0] sdc1[1]
      2930133440 blocks super 1.2 [2/2] [UU]
      bitmap: 0/22 pages [0KB], 65536KB chunk

unused devices: <none>

Code: Select all

[root@test ~]# mount /dev/md0 /mnt/Storage -t ext2
mount: wrong fs type, bad option, bad superblock on /dev/md0,
       missing codepage or helper program, or other error

       In some cases useful info is found in syslog - try
       dmesg | tail or so.

Code: Select all

[root@test ~]# dmesg | tail
[97021.702768] EXT4-fs (md0): VFS: Can't find ext4 filesystem
Pulling out my hair here.

OK I'll bite: Why are you using ext2?? I think etx2 was used back in the days of kernel 2.2. Why are you not using ext4? I think your computer is asking the same question:

[root@test ~]# dmesg | tail
[97021.702768] EXT4-fs (md0): VFS: Can't find ext4 filesystem


I'm sure there is a reason you are still using a FS last seen in the Jurassic Era.

User avatar
TrevorH
Forum Moderator
Posts: 23205
Joined: 2009/09/24 10:40:56
Location: Brighton, UK

Re: Issue mounting EXT2 FS

Post by TrevorH » 2018/06/16 11:30:44

Creation Time : Wed Jun 13 23:34:48 2018
That doesn't look great. That looks like you recreated your RAID array on the 13th at 23:24:48. If it had a filesystem on it before then I suspect it's gone. What is the output from file -s /dev/md0 ?

The ext2 module was deprecated in CentOS 7 but the functionality of the ext2 filesystem is now provided by the ext4 module. In nay case you shouldn't need to specify -t ext2 on the mount command as it should auto-detect any filesystem that is present.
CentOS 5 died in March 2017 - migrate NOW!
Full time Geek, part time moderator. Use the FAQ Luke

dustinduse
Posts: 4
Joined: 2018/06/15 03:45:00

Re: Issue mounting EXT2 FS

Post by dustinduse » 2018/06/16 17:05:33

Says "/dev/md0: data"
God i hope i didnt lose the data. I have moved this array a few times. And Its been a few years but i thought that was how i did it... Shit there was almost 2.5tb of data on those..

dustinduse
Posts: 4
Joined: 2018/06/15 03:45:00

Re: Issue mounting EXT2 FS

Post by dustinduse » 2018/06/16 17:06:27

desertcat wrote:
2018/06/16 04:32:12
OK I'll bite: Why are you using ext2?? I think etx2 was used back in the days of kernel 2.2. Why are you not using ext4? I think your computer is asking the same question:

[root@test ~]# dmesg | tail
[97021.702768] EXT4-fs (md0): VFS: Can't find ext4 filesystem


I'm sure there is a reason you are still using a FS last seen in the Jurassic Era.
This raid was originally setup like 7 years ago.

dustinduse
Posts: 4
Joined: 2018/06/15 03:45:00

Re: Issue mounting EXT2 FS

Post by dustinduse » 2018/06/16 17:11:33

TrevorH wrote:
2018/06/16 11:30:44
Creation Time : Wed Jun 13 23:34:48 2018
That doesn't look great. That looks like you recreated your RAID array on the 13th at 23:24:48. If it had a filesystem on it before then I suspect it's gone. What is the output from file -s /dev/md0 ?

The ext2 module was deprecated in CentOS 7 but the functionality of the ext2 filesystem is now provided by the ext4 module. In nay case you shouldn't need to specify -t ext2 on the mount command as it should auto-detect any filesystem that is present.
You sure are correct. I fsck up
"mdadm --assemble --scan --verbose /dev/md{number} /dev/{disk1} /dev/{disk2} /dev/{disk3} /dev/{disk4}"
is the correct command. And not the one i used.. Think i have a backup somewhere. hopefully.

desertcat
Posts: 418
Joined: 2014/08/07 02:17:29
Location: Tucson, AZ

Re: Issue mounting EXT2 FS

Post by desertcat » 2018/06/18 20:31:52

dustinduse wrote:
2018/06/16 17:11:33

You sure are correct. I fsck up
"mdadm --assemble --scan --verbose /dev/md{number} /dev/{disk1} /dev/{disk2} /dev/{disk3} /dev/{disk4}"
is the correct command. And not the one i used.. Think i have a backup somewhere. hopefully.
Hopefully you have a backup somewhere. I thought, maybe wrongly, that was was the idea behind RAID: If a drive failed there was one that pick up the slack with no loss of data. Just for fun what does fdisk -l show? I doubt all 4 disks failed. The data may still be on the disks unless you somehow managed to wipe out or deleted the information on them. Keep us posted.

MartinR
Posts: 329
Joined: 2015/05/11 07:53:27
Location: UK

Re: Issue mounting EXT2 FS

Post by MartinR » 2018/06/21 14:04:56

@desertcat: The problem here (AIUI) is that a disk didn't fail, dustinuse created a new raidset on top of his disks. It's as if you issued mkfs to a partition that already had a filesystem - the old filesystem is gone forever. Like, I suspect, all of us here I hope his backups are good; it's not a nice feeling to lose complete filesystems. :cry:

User avatar
TrevorH
Forum Moderator
Posts: 23205
Joined: 2009/09/24 10:40:56
Location: Brighton, UK

Re: Issue mounting EXT2 FS

Post by TrevorH » 2018/06/21 15:17:37

And RAID is not a backup. It's a protection against single disk failure (higher RAID levels allow protection against more than one failing). But it's not a backup - for example if I have a RAID array with a filesystem mounted and I rm -rf /raid then it's gone. Bye.
CentOS 5 died in March 2017 - migrate NOW!
Full time Geek, part time moderator. Use the FAQ Luke

desertcat
Posts: 418
Joined: 2014/08/07 02:17:29
Location: Tucson, AZ

Re: Issue mounting EXT2 FS

Post by desertcat » 2018/06/21 20:56:25

MartinR wrote:
2018/06/21 14:04:56
@desertcat: The problem here (AIUI) is that a disk didn't fail, dustinuse created a new raidset on top of his disks. It's as if you issued mkfs to a partition that already had a filesystem - the old filesystem is gone forever. Like, I suspect, all of us here I hope his backups are good; it's not a nice feeling to lose complete filesystems. :cry:

OOOPS!! That is NOT good!! Learned something new. I don't use RAID (unless it is to kill bugs!! :lol: ) But I've done some stupid things as well. I did have backups. I do hope he had backups. 2TB of data loss would be a disaster.

Post Reply