Can I resize a mounted LV?

Yes, you can resize a mounted Logical Volume (LV), but there are some considerations depending on whether you are increasing or decreasing its size:

1. Increasing the size of a mounted LV:

   • You can safely increase the size of a mounted LV. After resizing the LV, you will also need to resize the filesystem on it.

   Example:

   lvresize -L +10G /dev/vg_name/lv_name
   resize2fs /dev/vg_name/lv_name  # For ext4
   

2. Decreasing the size of a mounted LV:

   • You should unmount the filesystem before decreasing the size of the LV to avoid data corruption. If you cannot unmount it, you can use the resize2fs command to shrink the filesystem first, then resize the LV.

   Example:

   umount /dev/vg_name/lv_name
   lvresize -L -10G /dev/vg_name/lv_name
   resize2fs /dev/vg_name/lv_name  # For ext4
   

Always ensure you have backups before performing these operations, especially when decreasing the size.