Using the command df <MOUNTPOINT>, find the path to the LVM logical volume device node file (LV_PATH) for the specific filesystem mount point, for instance.
df /home
- Unmount the filesystem (necessitates stopping all access to the filesystem, e.g., for /home, all users will need to log out)
- Fsck the filesystem
- Shrink the filesystem
- Shrink the LVM logical volume
The above steps can be performed using lvresize –resizefs –size <SIZE> <LV_PATH>, for example:
lvresize --resizefs --size 20G /dev/VolGroup00/LogVol02 # Absolute size of 20 GiB lvresize --resizefs --size -260M /dev/VolGroup00/LogVol02 # 260 MiB less than current
The <SIZE> specified is handled as an absolute value unless a minus or plus sign is used to denote a relative number; otherwise, the <SIZE> specified is treated as a relative number.
Use the same command to increase the root LVM logical volume after the first logical volume has been shrunk down, for instance.
lvresize --resizefs --size 80G /dev/VolGroup00/LogVol00 # Absolute size of 80 GiB
lvresize --resizefs --size +972M /dev/VolGroup00/LogVol00 # 972 MiB more than current
Verify the final sizes of filesystem / and /home by using df <MOUNTPOINT>
