Linux Tutorials - Musab Syed | Restoring Lost LV and VG in LVM | Linux Tutorials 2024 | Linux

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Restoring Lost Logical Volume (LV) and Volume Group (VG) in LVM

If you've accidentally lost a Logical Volume (LV) or Volume Group (VG) in LVM (Logical Volume Manager), you can often recover them as long as the underlying data is intact. Here are the general steps to restore lost LV and VG:

1. Identify the Missing LV and VG:

First, confirm that you've indeed lost an LV and VG. You can use the lvdisplay and vgdisplay commands to list all LVs and VGs currently available on your system.
bash
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lvdisplay
vgdisplay
Look for your missing LV and VG in the list.
2. Check for Physical Volumes (PVs):

Verify that the physical volumes (PVs) containing the lost VG are still accessible and not corrupted. Use the pvdisplay command to list your physical volumes.
bash
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pvdisplay
Ensure that all PVs used by the lost VG are visible and active.
3. Scan for Missing VG and LV:

Run a scan to search for missing VGs and LVs. You can use the vgscan command to do this.
bash
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vgscan
This command will scan for any VGs that aren't currently active and try to restore them.
4. Activate the VG:

If the vgscan command finds your lost VG, you can activate it with the vgchange command. Replace VG_NAME with the name of your lost VG.
bash
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vgchange -ay VG_NAME
5. Mount the LV:

Once the VG is active, you can mount the LV and access your data. First, create a mount point if one doesn't already exist.
bash
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mkdir /mnt/my_mount_point
Mount the LV to the mount point.
bash
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mount /dev/VG_NAME/LV_NAME /mnt/my_mount_point
You should now be able to access your data under /mnt/my_mount_point.
6. Backup Your Data:

It's crucial to create a backup of your data as soon as you've successfully mounted the LV. This will ensure that you don't lose your data in case of further issues.
7. Investigate the Cause:

After recovering your LV and VG, investigate the cause of the issue that led to their loss in the first place to prevent it from happening again.
Keep in mind that the above steps assume that the data is intact, and the issue was related to the LVM configuration. If your data is corrupted or lost due to other reasons, data recovery tools and services may be necessary. Always be cautious when working with LVM to avoid accidental data loss.

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