Linux LVM learning summary & mdash; Delete volume group VG, lvmvg

Linux LVM learning Summary-delete volume group VG and lvmvg

In Linux, how does one delete a volume group (VG? The following describes how to delete a volume group (VG) for reference only. Thank you! In the following example, I want to delete the volume group VolGroup05.

Step 1: view the volume group (VG) information, as shown below

[root@getlnx01uat ~]# df -h

Filesystem            Size  Used Avail Use% Mounted on

/dev/mapper/VolGroup00-LogVol00

                       97G   36G   57G  39% /

/dev/mapper/VolGroup01-LogVol00

                       79G   33G   43G  44% /u01

/dev/mapper/VolGroup02-LogVol00

                      197G  182G  5.4G  98% /u02

/dev/mapper/VolGroup03-LogVol00

                      197G   57G  130G  31% /u03

/dev/mapper/VolGroup04-LogVol00

                      138G  118G   14G  90% /u04

/dev/mapper/VolGroup05-LogVol00

                      178G   48G  121G  29% /u05

/dev/sda1              99M   23M   71M  25% /boot

tmpfs                 2.0G     0  2.0G   0% /dev/shm

[root@getlnx01uat ~]# vgscan

  Reading all physical volumes.  This may take a while...

  Found volume group "VolGroup05" using metadata type lvm2

  Found volume group "VolGroup04" using metadata type lvm2

  Found volume group "VolGroup03" using metadata type lvm2

  Found volume group "VolGroup02" using metadata type lvm2

  Found volume group "VolGroup01" using metadata type lvm2

  Found volume group "VolGroup00" using metadata type lvm2

[root@getlnx01uat ~]# 

View the PV and LV information contained in the volume group VolGroup05. As shown below

[root@getlnx01uat ~]# vgdisplay -v VolGroup05

    Using volume group(s) on command line

    Finding volume group "VolGroup05"

  --- Volume group ---

  VG Name               VolGroup05

  System ID             

  Format                lvm2

  Metadata Areas        1

  Metadata Sequence No  2

  VG Access             read/write

  VG Status             resizable

  MAX LV                0

  Cur LV                1

  Open LV               1

  Max PV                0

  Cur PV                1

  Act PV                1

  VG Size               179.97 GB

  PE Size               32.00 MB

  Total PE              5759

  Alloc PE / Size       5759 / 179.97 GB

  Free  PE / Size       0 / 0   

  VG UUID               UNFxZH-lAGM-vqF3-jtNK-yuKT-enUX-WwL7FQ

  --- Logical volume ---

  LV Name                /dev/VolGroup05/LogVol00

  VG Name                VolGroup05

  LV UUID                kCTJnc-D3zQ-QiJp-TfPh-ivWs-WKyW-VvGTod

  LV Write Access        read/write

  LV Status              available

  # open                 1

  LV Size                179.97 GB

  Current LE             5759

  Segments               1

  Allocation             inherit

  Read ahead sectors     auto

  - currently set to     256

  Block device           253:2

  --- Physical volumes ---

  PV Name               /dev/sdg5     

  PV UUID               VbSwjS-9ckQ-ZfWf-bl8g-oPWQ-TMBi-H6oMWv

  PV Status             allocatable

  Total PE / Free PE    5759 / 0

2: unmount the logical Volume LV of the volume group

All logical volumes of the corresponding volume group VG must be detached. From the above information, we can see that the corresponding volume group VolGroup05 only has the logical Volume LV/dev/VolGroup05/LogVol00.

[root@getlnx01uat ~]# umount /dev/VolGroup05/LogVol00

You can also use the following command:

[root@getlnx01uat ~]# umount /u05

If the process is still using the file of the corresponding logical volume, the mount point must be forcibly uninstalled.

3: delete the logical Volume LV

[root@getlnx01uat ~]# lvremove /dev/VolGroup05/LogVol00

Do you really want to remove active logical volume LogVol00? [y/n]: y

  Logical volume "LogVol00" successfully removed

[root@getlnx01uat ~]# 

Verify that the LV is deleted

[Root @ getlnx01uat ~] # Lvdisplay | grep "dev/VolGroup05/LogVol00"

4: Delete the volume group VG

[root@getlnx01uat ~]# vgremove VolGroup05 

  Volume group "VolGroup05" successfully removed

[root@getlnx01uat ~]# 

If you delete the volume group VG securely, you must disable vg_name using vgchange-a n VolGroup05 before deleting it.

[root@getlnx01uat ~]# vgchange -a n VolGroup05

  0 logical volume(s) in volume group "VolGroup05" now active

[root@getlnx01uat ~]# vgremove VolGroup05 

  Volume group "VolGroup05" successfully removed

Verify whether the volume group (VG) is deleted

[root@getlnx01uat ~]# vgscan

Reading all physical volumes. This may take a while...

Found volume group "VolGroup04" using metadata type lvm2

Found volume group "VolGroup03" using metadata type lvm2

Found volume group "VolGroup02" using metadata type lvm2

Found volume group "VolGroup01" using metadata type lvm2

Found volume group "VolGroup00" using metadata type lvm2

[root@getlnx01uat ~]# 

5. delete a physical volume PV.

[root@getlnx01uat ~]# pvremove /dev/sdg5  

  Labels on physical volume "/dev/sdg5" successfully wiped

[root@getlnx01uat ~]# pvscan

  PV /dev/sde5   VG VolGroup04   lvm2 [139.97 GB / 0    free]

  PV /dev/sdd5   VG VolGroup03   lvm2 [199.97 GB / 0    free]

  PV /dev/sdc5   VG VolGroup02   lvm2 [199.97 GB / 0    free]

  PV /dev/sdb5   VG VolGroup01   lvm2 [79.97 GB / 0    free]

  PV /dev/sda2   VG VolGroup00   lvm2 [51.88 GB / 0    free]

  PV /dev/sdf5   VG VolGroup00   lvm2 [59.97 GB / 0    free]

  Total: 6 [731.72 GB] / in use: 6 [731.72 GB] / in no VG: 0 [0   ]

6. edit/etc/fstab and delete the mount information.

If this step is not processed, the system will encounter the following error during the restart process:

In Repair filesystem, files are protected and cannot be modified. Editing vi/etc/fstab cannot be saved.

You can run the following command to modify the System File Permission to read/write (rw), edit/etc/fstab, delete the mount point information, and restart the server to solve the problem.

mount -o remount, rw / 

References:

Http://wenku.baidu.com/view/459150d85022aaea998f0f20.html