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Logical Volume Management on [[Linux]]


=Link=
Logical Volume Management on [[Linux|Linux]]
*[http://www.andybotting.com/how-do-you-clone-an-lvm-partition How do you clone an lvm partition?]
 
*[https://github.com/radiorabe/rabe-zabbix/tree/master/app/LVM Monitoring with zabbix]
 
*[http://tldp.org/HOWTO/LVM-HOWTO/ HOWTO]
= Links =
*[https://www.theurbanpenguin.com/thin-provisioning-lvm2/ Thin provisioning]
 
*[http://www.howtoforge.com/linux_lvm Beginner's guide to LVM]
*[http://www.andybotting.com/how-do-you-clone-an-lvm-partition How do you clone an lvm partition?]  
*[http://theitdepartment.wordpress.com/2008/05/30/howto-resize-a-xen-drbd-lvm-vbd/ Resizing LVM + DRBD]
*[https://github.com/radiorabe/rabe-zabbix/tree/master/app/LVM Monitoring with zabbix]  
*http://wiki.tldp.org/LVM-on-RAID
*[http://tldp.org/HOWTO/LVM-HOWTO/ HOWTO]  
*[http://serverfault.com/questions/678642/linux-device-mapper-maps-lvm-pv-nested-inside-lv-when-taking-snapshot LVM nesting]
*[https://www.theurbanpenguin.com/thin-provisioning-lvm2/ Thin provisioning]  
*http://blog.gadi.cc/better-lvm-for-kvm/
*[http://www.howtoforge.com/linux_lvm Beginner's guide to LVM]  
*[https://www.tecmint.com/take-snapshot-of-logical-volume-and-restore-in-
*[http://theitdepartment.wordpress.com/2008/05/30/howto-resize-a-xen-drbd-lvm-vbd/ Resizing LVM + DRBD]  
*[http://tldp.org/HOWTO/LVM-HOWTO/snapshots_backup.html Taking a Backup Using Snapshots]
*[http://wiki.tldp.org/LVM-on-RAID http://wiki.tldp.org/LVM-on-RAID]
*[http://serverfault.com/questions/678642/linux-device-mapper-maps-lvm-pv-nested-inside-lv-when-taking-snapshot LVM nesting]  
*[http://blog.gadi.cc/better-lvm-for-kvm/ http://blog.gadi.cc/better-lvm-for-kvm/]
*[[https://www.tecmint.com/take-snapshot-of-logical-volume-and-restore-in- https://www.tecmint.com/take-snapshot-of-logical-volume-and-restore-in-]
*[http://tldp.org/HOWTO/LVM-HOWTO/snapshots_backup.html Taking a Backup Using Snapshots]
*[https://linoxide.com/identify-linux-lvm-mirror/ LVM mirrors]


NOTE: remember to add snapshot support when calling lvcreate
NOTE: remember to add snapshot support when calling lvcreate


=Related commands=
 
==lvdisplay==
 
== Raid on LVM ==
 
*[https://www.theurbanpenguin.com/striped-lvm-volumes/ Striped LVM volumes]
*[https://www.linuxsysadmins.com/create-striped-logical-volume-on-linux/ https://www.linuxsysadmins.com/create-striped-logical-volume-on-linux/]
 
 
 
= Related commands =
 
== lvdisplay ==
 
== lvrename ==


==lvrename==
  lvrename groupname oldname newname
  lvrename groupname oldname newname
==lsblk==


==partprobe==
== vgrename ==
 
== lsblk ==
 
== partprobe ==
 
== lvchange ==


==lvchange==
== vgchange ==


==vgchange==
== dmsetup ==


==dmsetup==
== vgs ==


==vgs==
== create physical volume ==


==create physical volume==
  pvcreate /dev/sda3
  pvcreate /dev/sda3


 
== lvcreate ==


==lvcreate==
  lvcreate -L12G -nmyvol myvolumegroup
  lvcreate -L12G -nmyvol myvolumegroup
  lvcreate -l 100%FREE -nmyvol myvolumegroup
  lvcreate -l 100%FREE -nmyvol myvolumegroup


==lvresize==  
== lvresize ==
 
  lvresize --resizefs -L-2G /dev/vg/foo
  lvresize --resizefs -L-2G /dev/vg/foo
or grow to all remaining space vg:
or grow to all remaining space vg:
  lvresize -l +100%FREE /dev/myvg/myvol
  lvresize -l +100%FREE /dev/myvg/myvol


==lvremove==
 
 
 
 
== lvremove ==
 
To remove all volumes in group VGname
To remove all volumes in group VGname
  lvremove VGname
  lvremove VGname


To remove a volume
To remove a volume
  lvremove VGname/LVname
  lvremove VGname/LVname
     
== Do you really want to remove active logical volume ==
lvchange -a n vgname/lvname
just to make sure
=== Logical volume X/Y contains a filesystem in use ===
https://www.thegeekdiary.com/lvremove-command-fails-with-error-lvm-cant-remove-open-logical-volume/
Could be NFS. Always remember NFS! If NFS has indeed been involved, restarting nfs service will most likely fix this.
== pvck ==


==pvck==
To find the metadata:
To find the metadata:
  pvck /dev/sdb1
  pvck /dev/sdb1


 


==LVM snapshot==
== LVM snapshot ==


*https://www.tecmint.com/take-snapshot-of-logical-volume-and-restore-in-
*[https://www.tecmint.com/take-snapshot-of-logical-volume-and-restore-in- https://www.tecmint.com/take-snapshot-of-logical-volume-and-restore-in-]


  lvcreate --size 1G --snapshot --name snap-1 /dev/myvg/mylv
  lvcreate --size 1G --snapshot --name snap-1 /dev/myvg/mylv
Line 66: Line 114:
where size should be enough to hold the data changes
where size should be enough to hold the data changes


=FAQ=
 
==Access logical volumes within logical volume==
 
 
 
= FAQ =
 
== Access logical volumes within logical volume ==
 
  partprobe /dev/mapper/vg-mydata
  partprobe /dev/mapper/vg-mydata
  lsblk
  lsblk
This will show the (sub) partitions/volumes, then edit /etc/lvm/lvm.conf
This will show the (sub) partitions/volumes, then edit /etc/lvm/lvm.conf
  filter = [ "a|.*/|", "a|mydata|","r|.*|" ]
  filter = [ "a|.*/|", "a|mydata|","r|.*|" ]
Then run:
Then run:
  vgscan
  vgscan
  lvscan
  lvscan
  vgs
  vgs
Now you should see the names of the volumes you're looking for, so now:
Now you should see the names of the volumes you're looking for, so now:
  vgchange -a y guestsname_mydata-home
  vgchange -a y guestsname_mydata-home
and then you should be able to  
 
and then you should be able to
 
  mount /dev/mapper/guestsname_mydata-home
  mount /dev/mapper/guestsname_mydata-home


When done, remember to change back the filter in lvm.conf, default is  
When done, remember to change back the filter in lvm.conf, default is
 
  filter = [ "a|.*/|" ]
  filter = [ "a|.*/|" ]
and of course then once again
and of course then once again
  vgscan
  vgscan
  lvscan
  lvscan


 
== vgreduce Can't remove final physical volume ==


==vgreduce Can't remove final physical volume==
Means you're trying to remove the last physical volume, instead just use


Means you're trying to remove the last physical volume, instead just use
  vgremove
  vgremove
==grow logical volume==
 
https://www.tldp.org/HOWTO/LVM-HOWTO/extendlv.html
== grow logical volume ==
 
[https://www.tldp.org/HOWTO/LVM-HOWTO/extendlv.html https://www.tldp.org/HOWTO/LVM-HOWTO/extendlv.html]
 
  lvextend -L+100G /dev/myvg/myvol
  lvextend -L+100G /dev/myvg/myvol


==Add disk to volume group==
== Add disk to volume group ==
 
  pvcreate /dev/sdc
  pvcreate /dev/sdc
  vgextend MYVG /dev/sdc
  vgextend MYVG /dev/sdc


And if you need space right now:
And if you need space right now:
  lvextend -l +100%FREE /dev/NYVG/mylv  
  lvextend -l +100%FREE /dev/NYVG/mylv  


And then grow fs
And then grow fs


==lvremove: Logical volume vg-kvm/vps-snapshot is used by another device.==
== lvremove: Logical volume vg-kvm/vps-snapshot is used by another device. ==


Could be kpartx, see
Could be kpartx, see
  /dev/mapper/
  /dev/mapper/


==lvremove Logical volume foo/bar in use==
== lvremove Logical volume foo/bar in use ==
 
check with lsof, fuser and:
check with lsof, fuser and:
  losetup -l
  losetup -l


to see if a /dev/dm-* looks familiar
to see if a /dev/dm-* looks familiar


 


*http://naveen161089.blogspot.nl/2014/03/forcefully-remove-lvm.html
*[http://naveen161089.blogspot.nl/2014/03/forcefully-remove-lvm.html http://naveen161089.blogspot.nl/2014/03/forcefully-remove-lvm.html]


some say lvchange -an the snapshot first, but that disables the lv it's connected to as well
some say lvchange -an the snapshot first, but that disables the lv it's connected to as well


OR
OR
  dmsetup info -c
  dmsetup info -c
http://blog.roberthallam.org/2017/12/solved-logical-volume-is-used-by-another-device/comment-page-1/
 
[http://blog.roberthallam.org/2017/12/solved-logical-volume-is-used-by-another-device/comment-page-1/ http://blog.roberthallam.org/2017/12/solved-logical-volume-is-used-by-another-device/comment-page-1/]
 
 
 
==lvremove Do you really want to remove and DISCARD active logical volume==
If you like, deactivate the volume first:
lvchange -an vgname/lvname
 


== Grow physical volume ==
== Grow physical volume ==
Assuming your LVM partition is the last one, use fdisk to delete and recreate it, remember to set type to LVM again and reboot.
 
Then use pvresize /dev/sdaX
Assuming your LVM partition is the last one, use fdisk to delete and recreate it, remember to set type to LVM again and reboot. Then use pvresize /dev/sdaX
 
Or just:
 
pvresize /dev/sdb
 
 
 


== Remove physical drive from a volume group ==
== Remove physical drive from a volume group ==
Make sure the data fits on remaining drive, then
 
Make sure the data fits on remaining drives, then
 
  pvmove /dev/sdbX
  pvmove /dev/sdbX
vgreduce /dev/sdbX




==Create volume group==
vgreduce vgname /dev/sdbX
 
== Create volume group ==
 
  vgcreate vgname /dev/sdc1 /dev/sdd1
  vgcreate vgname /dev/sdc1 /dev/sdd1


==Device /dev/sdb excluded by filter==
== pvcreate Can't open /dev/sdg exclusively. Mounted filesystem? ==
 
[https://blog.hqcodeshop.fi/archives/274-Replacing-physical-drive-for-LVM-pvcreate-Cant-open-dev-exclusively.html https://blog.hqcodeshop.fi/archives/274-Replacing-physical-drive-for-LVM-pvcreate-Cant-open-dev-exclusively.html]
 
 
 
== Device /dev/sdb excluded by filter ==
 
Check disk label(gpt!!
 
Try:
Try:
  wipefs -af /dev/sdb


  wipefs -af /dev/sdg
 
 
== WARNING: Device /dev/dm-17 not initialized in udev database even after waiting 10000000 microseconds. ==
Try
udevadm trigger
 
== wipefs: error: /dev/sdg: probing initialization failed: Device or resource busy ==


try all ways to unbusy
== Check if volume is in use ==


==Check if volume is in use==
  dmsetup info -c
  dmsetup info -c
Check the 'Open' column
Check the 'Open' column


[[Category: System Administration]]
== WARNING: PV /dev/sda5 in VG foo-vg is using an old PV header, modify the VG to update. ==
[[Category: Linux]]
 
vgck --updatemetadata foo-vg
 
 
 
== Mount logical volume from disk image ==
 
kpartx -av /path/to.img
lvscan
mount /dev/mapper/what-ever-var /mnt/loop
  [[Category:System Administration]] [[Category:Linux]]

Revision as of 15:21, 29 October 2021

Logical Volume Management on Linux


Links

NOTE: remember to add snapshot support when calling lvcreate

 

Raid on LVM

 

Related commands

lvdisplay

lvrename

lvrename groupname oldname newname

vgrename

lsblk

partprobe

lvchange

vgchange

dmsetup

vgs

create physical volume

pvcreate /dev/sda3

 

lvcreate

lvcreate -L12G -nmyvol myvolumegroup
lvcreate -l 100%FREE -nmyvol myvolumegroup

lvresize

lvresize --resizefs -L-2G /dev/vg/foo

or grow to all remaining space vg:

lvresize -l +100%FREE /dev/myvg/myvol

 

 

lvremove

To remove all volumes in group VGname

lvremove VGname

To remove a volume

lvremove VGname/LVname
      

Do you really want to remove active logical volume

lvchange -a n vgname/lvname

just to make sure


Logical volume X/Y contains a filesystem in use

https://www.thegeekdiary.com/lvremove-command-fails-with-error-lvm-cant-remove-open-logical-volume/

Could be NFS. Always remember NFS! If NFS has indeed been involved, restarting nfs service will most likely fix this.

pvck

To find the metadata:

pvck /dev/sdb1

 

LVM snapshot

lvcreate --size 1G --snapshot --name snap-1 /dev/myvg/mylv

where size should be enough to hold the data changes

 


FAQ

Access logical volumes within logical volume

partprobe /dev/mapper/vg-mydata
lsblk

This will show the (sub) partitions/volumes, then edit /etc/lvm/lvm.conf

filter = [ "a|.*/|", "a|mydata|","r|.*|" ]

Then run:

vgscan
lvscan
vgs

Now you should see the names of the volumes you're looking for, so now:

vgchange -a y guestsname_mydata-home

and then you should be able to

mount /dev/mapper/guestsname_mydata-home

When done, remember to change back the filter in lvm.conf, default is

filter = [ "a|.*/|" ]

and of course then once again

vgscan
lvscan

 

vgreduce Can't remove final physical volume

Means you're trying to remove the last physical volume, instead just use

vgremove

grow logical volume

https://www.tldp.org/HOWTO/LVM-HOWTO/extendlv.html

lvextend -L+100G /dev/myvg/myvol

Add disk to volume group

pvcreate /dev/sdc
vgextend MYVG /dev/sdc

And if you need space right now:

lvextend -l +100%FREE /dev/NYVG/mylv 

And then grow fs

lvremove: Logical volume vg-kvm/vps-snapshot is used by another device.

Could be kpartx, see

/dev/mapper/

lvremove Logical volume foo/bar in use

check with lsof, fuser and:

losetup -l

to see if a /dev/dm-* looks familiar

 

some say lvchange -an the snapshot first, but that disables the lv it's connected to as well

OR

dmsetup info -c

http://blog.roberthallam.org/2017/12/solved-logical-volume-is-used-by-another-device/comment-page-1/

 

lvremove Do you really want to remove and DISCARD active logical volume

If you like, deactivate the volume first:

lvchange -an vgname/lvname


Grow physical volume

Assuming your LVM partition is the last one, use fdisk to delete and recreate it, remember to set type to LVM again and reboot. Then use pvresize /dev/sdaX

Or just:

pvresize /dev/sdb

 


Remove physical drive from a volume group

Make sure the data fits on remaining drives, then

pvmove /dev/sdbX


vgreduce vgname /dev/sdbX

Create volume group

vgcreate vgname /dev/sdc1 /dev/sdd1

pvcreate Can't open /dev/sdg exclusively. Mounted filesystem?

https://blog.hqcodeshop.fi/archives/274-Replacing-physical-drive-for-LVM-pvcreate-Cant-open-dev-exclusively.html

 

Device /dev/sdb excluded by filter

Check disk label(gpt!!

Try:

 wipefs -af /dev/sdg

 

 

WARNING: Device /dev/dm-17 not initialized in udev database even after waiting 10000000 microseconds.

Try

udevadm trigger

 

wipefs: error: /dev/sdg: probing initialization failed: Device or resource busy

try all ways to unbusy

Check if volume is in use

dmsetup info -c

Check the 'Open' column

WARNING: PV /dev/sda5 in VG foo-vg is using an old PV header, modify the VG to update.

vgck --updatemetadata foo-vg

 

Mount logical volume from disk image

kpartx -av /path/to.img
lvscan
mount /dev/mapper/what-ever-var /mnt/loop