What is Vgexport and Vgimport in Linux?

By Other

What is Vgexport and Vgimport in Linux?

The vgexport command makes an inactive volume group inaccessible to the system, which allows you to detach its physical volumes. The vgimport command makes a volume group accessible to a machine again after the vgexport command has made it inactive.

What is Vgimport?

DESCRIPTION top. vgimport makes exported VGs known to the system again, perhaps after moving the PVs from a different system. vgexport clears the VG system ID, and vgimport sets the VG system ID to match the host running vgimport (if the host has a system ID).

How do I import and export VG in Linux?

LVM Export and Import Workflow:

  1. Due to use a duplicate volume group name. rename the volume group first on old machine. vgrename UUID New_VG_Name.
  2. unmount the file system from OLD Virtual Linux/Unix Server. umount /mount-point/ vgchange -an New_VG_Name.
  3. move a whole volume group to another system. pvscan. vgimport New_VG_Name.

How do I move logical volume to another volume group?

Moving file systems from one volume group to another

  1. Copy the source logical volume to the desired volume group with the cplv command.
  2. All JFS and JFS2 file systems require a log device.
  3. Change the filesystem to reference a log device that exists in the new volume group and the new logical volume with the chfs command.

How do I migrate LVM to another server?

Resolution

  1. Umount the file system ( If required make use of “rescue” mode ).
  2. Mark the volume group inactive.
  3. Export the volume group.
  4. When the machine is shut down, the disk can be unplugged and then connected to it’s new machine.
  5. When plugged into the new system it becomes /dev/sdb so an initial pvscan shows:

How use Vgreduce Linux?

To remove unused physical volumes from a volume group, use the vgreduce command. The vgreduce command shrinks a volume group’s capacity by removing one or more empty physical volumes. This frees those physical volumes to be used in different volume groups or to be removed from the system.

How do I import a sound group in Linux?

The logical volume from this volume group is initially mounted at /data01.

  1. Un-mount the file system. If required switch to “rescue” mode.
  2. Mark the volume group inactive.
  3. Export the volume group.
  4. Un-present the Disk.
  5. Present the Disk to the new Server.
  6. Import the Volume Group.
  7. Activate the volume group.
  8. Mount the file system.

What is Vgchange in Linux?

The vgchange -a y command activates the VolumeGroupName , and all associated physical and logical volumes. When a volume group is activated, it is available for use, its logical volumes are available, and its physical extents are synchronized (if they are stale).

How do I mount a LVM partition to another system?

The procedure to mount LVM partition in Linux as follows:

  1. Run vgscan command scans all supported LVM block devices in the system for VGs.
  2. Execute vgchange command to activate volume.
  3. Type lvs command to get information about logical volumes.
  4. Create a mount point using the mkdir command.

What is Vgchange command?

The vgchange command activates or deactivates one or more volume groups. The change depends on the value specified by the -a flag; namely, y or n. The vgchange -a n command deactivates the VolumeGroupName and its associated logical volumes. You must close the logical volumes prior to invoking the vgchange -a n command.

How do you check if VG is active or not?

You may check the status of the volume group by issuing the lsvg command. Depending on your configuration, the lsvg command returns the following settings: VG STATE will be active if it is varied on either actively or passively.

What is Pvmove?

pvmove moves the allocated physical extents (PEs) on a source PV to one or more destination PVs. You can optionally specify a source LV in which case only extents used by that LV will be moved to free (or specified) extents on the destination PV.

What is LVM migration?

LVM migration is one of the excellent feature, where we can migrate the logical volumes to a new disk without the data-loss and downtime. The purpose of this feature is it to move our data from old disk to a new disk. Usually, we do migrations from one disk to other disk storage, only when an error occur in some disks.

What is San Migration Linux?

Storage migration is the day to day activity of every Linux/Unix system administrator. In the IT production environment, we have to move data from one LUN (logical unit number) to another very safely without any downtime or less downtime and without corrupting the data.

How do I permanently mount LVM?