Difference between revisions of "Logical Volume Manager (Linux)"
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* Create snapshots | * Create snapshots | ||
| − | LVM introduces the concept of Volume | + | LVM introduces the concept of [[Volume Group]]s (VGs) and [[Logical Volume]]s (LVs). |
* Configuration file: <code>/etc/lvm/[[lvm.conf]]</code> | * Configuration file: <code>/etc/lvm/[[lvm.conf]]</code> | ||
| Line 60: | Line 60: | ||
* [[linux/mdadm|mdadm]] and [[Linux Administration/Devices and Filesystems/ZFS|ZFS]] | * [[linux/mdadm|mdadm]] and [[Linux Administration/Devices and Filesystems/ZFS|ZFS]] | ||
* [[resize2fs]]<ref>https://manpages.debian.org/stretch/e2fsprogs/resize2fs.8.en.html</ref> file system resizer for ext2/ext3/ext4 (resize2fs /dev/mapper/VolGroup-lv_root) (for ext4 only).<ref>https://www.technomenace.com/2014/08/how-to-extend-lvm-on-qcow2-images/</ref>. Code: https://github.com/tytso/e2fsprogs/blob/master/resize/resize2fs.c | * [[resize2fs]]<ref>https://manpages.debian.org/stretch/e2fsprogs/resize2fs.8.en.html</ref> file system resizer for ext2/ext3/ext4 (resize2fs /dev/mapper/VolGroup-lv_root) (for ext4 only).<ref>https://www.technomenace.com/2014/08/how-to-extend-lvm-on-qcow2-images/</ref>. Code: https://github.com/tytso/e2fsprogs/blob/master/resize/resize2fs.c | ||
| − | * [[ | + | * [[Ansible]] LV module: https://docs.ansible.com/ansible/latest/modules/lvol_module.html#lvol-module |
| − | * | + | * {{dmsetup}} |
* [[UUID]] | * [[UUID]] | ||
| − | + | * {{kpartx}} | |
Latest revision as of 10:05, 20 September 2020
Logical Volume Manager (LVM)[1] available in Linux allows manage multiple physical volumes or entire hard disks. It supports among other functionalities:
- Create single logical volumes of multiple physical volumes or entire hard disks
- Add or remove volumes/disk dynamically
- Increase or decrease size of Logical Volumes (LVs)
- Create snapshots
LVM introduces the concept of Volume Groups (VGs) and Logical Volumes (LVs).
- Configuration file:
/etc/lvm/lvm.conf
Contents
Components[edit]
Basic commands[edit]
- Display commands:
- Create commands:
- Ls commands:
pvs,lvs[7],vgs - Scan commands:
pvscan[8],vgscan - PV commands:
pvdisplay[9],pvresize,pvscan,pvcreateorpvcreate -vv - LV commands:
lvcreate[10], lvconvert - VG commands:
vgdisplay,vgcreate,vgcfgbackup,vgscan - LVM commands:
lvm dumpconfig
Advanced commands[edit]
lvchange[11] — Change attributes of the Logical Volume Manager.lvmdiskscan. Deprecated: usedpvs. Scan for all devices visible to LVM2.lvmdump— Create lvm2 information dumps for diagnostic purposes.
Activities[edit]
Basic[edit]
- Read StackOverflow LVMs questions: https://superuser.com/questions/tagged/lvm?tab=Votes
- Read Configuring and Managing Logical Volumens in RHEL 8: https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/8/html-single/configuring_and_managing_logical_volumes/index
- Configure an LVM Volume with an ext File Sytem: https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7/html/high_availability_add-on_administration/s1-lvmsetupnfs-haaa
Advanced[edit]
Before doing these exercises make your you have a backup of your data.
- Convert a Linear Device to a RAID device: https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/8/html-single/configuring_and_managing_logical_volumes/index#proc_converting-linear-to-raid-configure-manage-raid
- Read LVM Changelog: sourceware.org/git/?p=lvm2.git;a=blame;f=WHATS_NEW;hb=9cad26be321844868a904c7b07bebe37be4e0169
See also[edit]
- scan:
pvscanvgscan - LVM:
lvslvmscanlvm fullreportlvmreportlvmconfiglvmdumplvmchecklvm dumpconfig - Scan:
pvsvgslvspvscanvgscan - PV:
pvcreatepvremovepvscanpvremovepvscanpvspvchangepvckpvdisplaypvresize - LV:
lvdisplaylvcreatelvremove,lvresize,lvextend,lvreduce,lvrename - VG:
vgdisplay,vgcreate,vgremove,vgextend,vgreduce,vgscan,vgchange,vgrename,vgcfgbackup,vgcfgrestore,vgimportclone,vgck - Check commands:
pvckvgck
- mdadm and ZFS
- resize2fs[12] file system resizer for ext2/ext3/ext4 (resize2fs /dev/mapper/VolGroup-lv_root) (for ext4 only).[13]. Code: https://github.com/tytso/e2fsprogs/blob/master/resize/resize2fs.c
- Ansible LV module: https://docs.ansible.com/ansible/latest/modules/lvol_module.html#lvol-module
- Device mapper:
dmsetup,dmsetup ls, LVM,/dev/mapper/,vgcreate - UUID
kpartx
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Original Source: https://en.wikiversity.org/wiki/Linux_Administration/Devices_and_Filesystems/LVM
- ↑ http://man7.org/linux/man-pages/man8/lvm.8.html
- ↑ http://man7.org/linux/man-pages/man8/vgs.8.html
- ↑ http://man7.org/linux/man-pages/man8/lvs.8.html
- ↑ http://man7.org/linux/man-pages/man8/pvdisplay.8.html
- ↑ http://man7.org/linux/man-pages/man8/pvcreate.8.html
- ↑ http://man7.org/linux/man-pages/man8/lvcreate.8.html
- ↑ http://man7.org/linux/man-pages/man8/lvs.8.html
- ↑ http://man7.org/linux/man-pages/man8/pvscan.8.html
- ↑ http://man7.org/linux/man-pages/man8/pvdisplay.8.html
- ↑ http://man7.org/linux/man-pages/man8/lvcreate.8.html
- ↑ http://man7.org/linux/man-pages/man8/lvchange.8.html
- ↑ https://manpages.debian.org/stretch/e2fsprogs/resize2fs.8.en.html
- ↑ https://www.technomenace.com/2014/08/how-to-extend-lvm-on-qcow2-images/
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