Difference between revisions of "/dev/mapper"
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The library libdevmapper.so is used for LVM management. | The library libdevmapper.so is used for LVM management. | ||
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+ | == 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 == | == cache directory full == | ||
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Shows the top 10 files taking up the most space. | 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 |
Revision as of 00:45, 1 November 2019
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.
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