/dev/mapper
The /dev/mapper/distro--vg-root in place of a traditional /dev/sdxN block device just indicates that you chose to install the system using LVM2 logical volume management.
The devices in /dev/mapper are Logical Volumes. Logical Volume Manager (LVM) uses /dev/mapper and is considered a vastly superior way to manage storage space compared to just creating regular partitions with file systems on various disks.
The subfolders under /dev/mapper are the names of Volume Groups with the device nodes in those subfolders representing Logical Volumes.
The library libdevmapper.so is used for LVM management.
the command
sudo lvmdiskscan
will display all available block devices that LVM can interact with
distibution specific nodes
- /dev/mapper/centos-root
- /dev/mapper/mint--vg-root
- /dev/mapper/Kronos--vg-root
- /dev/mapper/VG-root--lv
- /dev/mapper/system-lv_root
- /dev/mapper/fedora-root
- /dev/mapper/ubuntu--vg-ubuntu--lv
cache directory full
with the command
df -h|grep mapper
To find out if it is full. Look for something like:
/dev/mapper/mint--vg-root 101G 61G 36G 64% /
to find out whats filling it up. A big cache file from gimp or something like that
sudo du -a /home | sort -n -r | head -n 10
Shows the top 10 files taking up the most space.
$ sudo vgs
VG #PV #LV #SN Attr VSize VFree mint-vg 1 2 0 wz--n- 118.26g 0
