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 ==
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* /dev/mapper/centos-root
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* /dev/mapper/mint--vg-root
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* /dev/mapper/Kronos--vg-root
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* /dev/mapper/VG-root--lv
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* /dev/mapper/system-lv_root
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* /dev/mapper/fedora-root
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* /dev/mapper/ubuntu--vg-ubuntu--lv
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 +
  
 
== 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.
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$ sudo vgs
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  VG      #PV #LV #SN Attr  VSize  VFree
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  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