How do I fix logical volume in Linux?

When a disk is accidentally removed or damaged in some way that adversely affects the logical volume, the general recovery process is:

Table of Contents

Replace the failed or missing disk.
Restore the missing disk’s UUID.
Restore the LVM meta data.
Repair the file system on the LVM device.

How do I run fsck manually in Linux?

Run fsck on Linux Root Partition

To do so, power on or reboot your machine through the GUI or by using the terminal: sudo reboot.
Press and hold the shift key during boot-up.
Select Advanced options for Ubuntu.
Then, select the entry with (recovery mode) at the end.
Select fsck from the menu.

Can we run fsck on mounted file system?

1 Answer. Do not run fsck on a live or mounted file system. fsck is used to check and optionally repair a Linux file systems. Running fsck on a mounted filesystem can usually result in disk and/or data corruption.

How do I fix fsck error?

In (initramfs) prompt, type the command “fsck” then the path to your hard drive, for example “fsck /deb/sda2” , after add “-y” in order to accept all the fixing errors, for example “fsck /dev/sda2 -y”, then the computer will check the errors on the filesystem to repair them.

How do I restore logical volume if deleted by mistake?

If you have accidentally removed a logical volume (LV) or LVM meta data got corrupted or damaged in some way, it can be easily restored without losing the data using the ‘vgcfgrestore’ command.

How can I check my LVM status?

Use the vgdisplay command to verify whether the LVM configuration in memory has problems. If the LVM configuration is working properly, there are no error messages, and the display shows the following: The status is available (or available/exclusive for Serviceguard volume groups).

How do I force fsck?

How to force fsck to check filesystem after system reboot on Linux when using systemd

Edit the /etc/default/grub file on Debian/Ubuntu.
Find line that read as GRUB_CMDLINE_LINUX_DEFAULT and append the fsck.
Then run an sudo update-grub.
Reboot the Linux system by tying the sudo reboot.
After that system will boot.

Can fsck cause data loss?

FSCK stands for “File System Consistency check.” Also, data loss is a possibility when you use this command so you should ensure that you have backup of your data before you proceed with the filesystem check.

Can we run fsck on root partition?

Never run fsck on mounted partitions as it may damage the file system. Before attempting to check or repair file systems always unmount it first. The fsck command is a wrapper for the various Linux filesystem checkers ( fsck. * ) and accepts different options depending on the file system’s type.

How do I restore my LVM volume?

Step 1: List backup file to restore LVM metadata in Linux.
Step 2: Restore PV (Physical Volume) in Linux.
Step 3: Restore VG to recover LVM2 partition.
Step 4: Activate the Volume Group.
Step 5: Verify the data loss after LVM2 partition recovery.

How do I recreate LVM?

Creating 1GiB LVM partition with parted

Run parted /dev/sdd command. This command will initiate parted command on /dev/sdd disk.
Use mklab command with msdos value to set the type of disk to MBR.
Use mkpart command to create a 1GiB partition.
Use set command with lvm on value to change the partition type to lvm.

Why should I use LVM?

Advantages of LVM

The biggest advantage of LVM is that both logical and physical volumes can be created, deleted and resized online, without any restarts. Logical volumes can also be resized dynamically, so you can start for example with a small partition and configure it to expand as data is written on it.

What is LVM command?

Logical Volume Manager (LVM) is used on Linux to manage hard drives and other storage devices. As the name implies, it can sort raw storage into logical volumes, making it easy to configure and use.

How do I restart and run fsck?

The procedure is as follows:

Edit the /etc/default/grub file on Debian/Ubuntu.
Find line that read as GRUB_CMDLINE_LINUX_DEFAULT and append the fsck.
Then run an sudo update-grub.
Reboot the Linux system by tying the sudo reboot.
After that system will boot.

How does fsck work Linux?

fsck computes the number of data blocks and compares that block count against the number of blocks the inode claims. If an inode contains an incorrect count, fsck prompts you to fix it. Each inode contains a 64-bit size field.

What fsck will do?

The fsck command computes the number of data blocks and compares that block count against the number of blocks that the inode claims. If an inode contains an incorrect count, the fsck command prompts you to fix it.

Why is fsck needed?

If you have a file system that is in read-only state or has developed some sort of corruption, it needs to be repaired before it can be used again. In order to do so, it must go through a procedure called “file system check” or FSCK for short.

What happens if a disk fails in LVM?

what happens if /dev/sdb fails? Your lvol1 will no longer work. Losing one drive means losing 5 drives worth of data. The volume will have a huge chunk of data missing (entire disk gone) and most likely, whichever filesystem you are using on top of that won’t like it one bit.

How do I create a new LV?

In order to create LVM logical volumes, here is a basic four step procedure:

Create partitions to be used and initialize them as physical volumes.
Create a volume group.
Create a logical volume.
Create a file system on a logical volume.

How do you remove LV?

Step 1: Delete entry from /etc/fstab. # cat /etc/fstab.
Step 2: unmount the partition. # umount /data.
Step 3: Disable LVM. # lvchange -an /dev/CVOL/workspace.
Step 4: Delete LVM volume.
Step 5: Disable volume group.
Step 6: Delete physical volumes used for volume group “vg”

Does LVM affect performance?

The tests seem to suggest the performance drop can be from 15% to 45% with LVM, compared to when not using it. They found an even bigger drop when two physical partitions are used within one LVM setup. They concluded that the biggest performance impacts were the use of LVM, as well as the complexity of it’s use.

Is Linux LVM good?

LVM can be extremely helpful in dynamic environments, when disks and partitions are often moved or resized. While normal partitions can also be resized, LVM is a lot more flexible and provides extended functionality. As a mature system, LVM is also very stable and every Linux distribution supports it by default.

How do I know if my filesystem is corrupted?

The Linux fsck command can be used to check and repair a corrupted filesystem under some situations.
…
Example: Using Fsck to Check and Repair a Filesystem

Change to single user mode.
List the mount points on your system.
Unmount all filesystems from /etc/fstab .
Find the logical volumes.

How do you create a mirrors logical volume?

When you create a mirrored logical volume, LVM ensures that data written to an underlying physical volume is mirrored onto a separate physical volume. With LVM, you can create mirrored logical volumes with multiple mirrors. An LVM mirror divides the device being copied into regions that are typically 512KB in size.

Why we create LVM in Linux?

The main advantages of LVM are increased abstraction, flexibility, and control. Logical volumes can have meaningful names like “databases” or “root-backup”. Volumes can be resized dynamically as space requirements change and migrated between physical devices within the pool on a running system or exported easily.

How do I fix logical volume in Linux?