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I have recently been dealing with LVM and tried to resize a logical volume to 50 GB from 100GB which normally was using ~48GB of it's available space. However, something happened and the volume got corrupted. I noticed that the size of volume has grown over 50GB somehow and I am now unable to access it.
Thought about running fsck and here's what I see;
The filesystem size (according to the superblock) is 7864320 blocks
The physical size of the device is 524288 blocks
Either the superblock or the partition table is likely to be corrupt!
Unlike the other volumes which can be mounted and unmounted to do resizing or other maintenance the root volume cannot be resized while it is mounted. You'll will need to use a linux recuse CD with LVM support to work on the lvm root volume.
Also, you must have enough free space to shrink volumes or data lost can occur. Most guides recommend backing up your data before resizing especially when shrinking.