0

I have a ext4 file system that is part of a Logical Volume and the underlying storage is AWS EBS. I took a snapshot of the EBS and then used that to create a new EBS volume and attached it to theEC2 instance.

Since this is a binary copy of the original volume it shared the same UUID as the original LV, so I tried this to add the new device partition (/dev/xvdi1) into an existing volume group:

> # pvremove /dev/xvdi1
  Labels on physical volume "/dev/xvdi1" successfully wiped  
> # pvcreate /dev/xvdi1
 Physical volume "/dev/xvdi1" successfully created
> 
> # vgextend VGoraarch /dev/xvdi1  
 Volume group "VGoraarch" successfully extended
> 
> # lvcreate -l 100%FREE -n LVoraarch_snapshot VGoraarch /dev/xvdi1
> Logical volume "LVoraarch_snapshot" created.

When I try to do the mount:

> # mount -t ext4 /dev/mapper/VGoraarch-LVoraarch_snapshot /oraarch_snapshot mount: wrong fs type, bad option, bad superblock on
> /dev/mapper/VGoraarch-LVoraarch_snapshot,
>        missing codepage or helper program, or other error
>        In some cases useful info is found in syslog - try
>        dmesg | tail  or so

What's the correct way to get this mounted?

EDIT: Mounting to the same EC2 instance

1

All you need to do is import it. Example:

# pvscan
pvscan -- reading all physical volumes (this may take a while...)
pvscan -- inactive PV "/dev/sdb1"  is in EXPORTED VG "design" [996 MB / 996 MB free]
pvscan -- inactive PV "/dev/sdb2"  is in EXPORTED VG "design" [996 MB / 244 MB free]
pvscan -- total: 2 [1.95 GB] / in use: 2 [1.95 GB] / in no VG: 0 [0]

# vgimport design
Volume group "vg" successfully imported

# vgchange -ay design

# mkdir -p /mnt/design/users
# mount /dev/design/users /mnt/design/users

(Copied from http://tldp.org/HOWTO/LVM-HOWTO/recipemovevgtonewsys.html)

| improve this answer | |
  • Looks like I had to fsfreeze the file system first before initiating the snapshot, a step I totally missed. Then I used vgimportclone to create a cloned VG.Then I was able to mount the fs. – Pete Feb 13 at 16:30
  • I see; I misread your question and thought you were mounting it on a different instance in which case vgimportclone isn't needed. – Mark Wagner Feb 14 at 18:06

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.