What is dev mapper VolGroup?

What is dev mapper VolGroup?

/dev/mapper/VolGroup-lv_root is a logical volume. Through the df – h command, you can find that it is associated with the ‘/’ root partition. You can also understand it as the root partition. It is easy to find out and confirm whether it is an important file. If not, it will not be deleted.

What is the use of Dev Mapper?

Device Mapper is a kernel-based framework that underpins many advanced volume management technologies on Linux. Docker’s devicemapper storage driver leverages the thin provisioning and snapshotting capabilities of this framework for image and container management.

Why dev mapper?

The Device Mapper provides the foundation for a number of higher-level technologies. In addition to LVM, Device-Mapper multipath and the dmraid command use the Device Mapper. LVM logical volumes are activated using the Device Mapper. Each logical volume is translated into a mapped device.

How do I resize a dev Mapper?

TL;DR

1. Check available space on the VG: vgdisplay . If enough go to 4.
2. If you don’t have space add a disk and create a PV: pvcreate /dev/sdb1.
3. Extend the VG: vgextend vg0 /dev/sdb1.
4. Extend the LV: lvextend /dev/vg0/lv0 -L +5G.
5. Check: lvscan.
6. Resize the file system: resize2fs /dev/vg0/lv0.
7. Check: df -h | grep lv0.

How do I clean up Dev Mapper RHEL root?

1 Answer

1. Delete some unnecessary files from root so that you can store the backup of /home in this directory.
2. Backup the contents of /home as:
3. Test the backup tar -tvf /root/home.tgz.
4. Need to unmount /home umount /dev/mapper/rhel-home.
5. Remove home logical volume lvremove /dev/mapper/rhel-home.

What does / Dev / mapper / volgroup00-logvol00 stand for?

Now i don’t know if /dev/mapper/VolGroup00-LogVol00 it’s a generic linux name for hdd or if it came up cause i have alocated 100GB from the storage. Point is, if it is the 100GB space * (unalocated) i want to alocate them, how do i do that ?

Do you really want to reduce volgroup / LV _ home?

Do you really want to reduce VolGroup/lv_home? [y/n]: y Size of logical volume VolGroup/lv_home changed from 1000.00 GiB (256000 extents) to 200.00 GiB (51200 extents). Logical volume lv_home successfully resized.

What is / Dev / mapper / VG _ root-LV-root directory?

– Stack Overflow What is /dev/mapper/vg_root-lv_root directory? Why my docker relies on this directory?