Editing Logical Volume Manager (Linux)
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− | + | [[w:Logical_Volume_Manager_(Linux)|LVM]]<ref>http://man7.org/linux/man-pages/man8/lvm.8.html</ref> 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 | * Create single logical volumes of multiple physical volumes or entire hard disks | ||
* Add or remove volumes/disk dynamically | * Add or remove volumes/disk dynamically | ||
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* Create snapshots | * Create snapshots | ||
− | LVM introduces the concept of | + | LVM introduces the concept of Volume Groups (VGs) and Logical Volumes (LVs). |
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== Basic commands == | == Basic commands == | ||
− | * List Volume Groups:<code>[[vgs]]</code><ref>http://man7.org/linux/man-pages/man8/vgs.8.html</ref> | + | * List Volume Groups:<code>[[/vgs/]]</code><ref>http://man7.org/linux/man-pages/man8/vgs.8.html</ref> |
− | ** <code>[[vgscan]]</code>, <code>[[vgextend]]</code>, <code>[[vgdisplay]]</code> | + | ** <code>[[/vgscan/]]</code>, <code>[[/vgextend/]]</code>, <code>[[/vgdisplay/]]</code> |
− | * List logical volumes: <code>[[lvs]]</code><ref>http://man7.org/linux/man-pages/man8/lvs.8.html</ref>, [[lvdisplay]] | + | * List logical volumes: <code>[[/lvs/]]</code><ref>http://man7.org/linux/man-pages/man8/lvs.8.html</ref>, [[/lvdisplay/]] |
* Resize LV: | * Resize LV: | ||
− | ** <code> | + | ** <code>lvresize</code> |
− | ** <code> | + | ** <code>lvextend</code> |
− | ** <code> | + | ** <code>lvreduce</code> |
* Display commands: | * Display commands: | ||
− | ::<code>[[pvdisplay]]</code><ref>http://man7.org/linux/man-pages/man8/pvdisplay.8.html</ref> | + | ::<code>[[/pvdisplay/]]</code><ref>http://man7.org/linux/man-pages/man8/pvdisplay.8.html</ref> |
− | ::<code>[[lvdisplay]]</code> | + | ::<code>[[/lvdisplay/]]</code> |
− | ::<code>[[vgdisplay]]</code> | + | ::<code>[[/vgdisplay/]]</code> |
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* Create commands: | * Create commands: | ||
− | ::<code>[[pvcreate]]</code><ref>http://man7.org/linux/man-pages/man8/pvcreate.8.html</ref> | + | ::<code>[[/pvcreate/]]</code><ref>http://man7.org/linux/man-pages/man8/pvcreate.8.html</ref> |
− | ::<code>[[lvcreate]]</code><ref>http://man7.org/linux/man-pages/man8/lvcreate.8.html</ref> | + | ::<code>[[/lvcreate/]]</code><ref>http://man7.org/linux/man-pages/man8/lvcreate.8.html</ref> |
− | ::<code>[[vgcreate | + | ::<code>[[/vgcreate/]]</code> |
− | + | * Ls commands: <code>[[pvs]]</code>, <code>[[/lvs/]]</code><ref>http://man7.org/linux/man-pages/man8/lvs.8.html</ref>, <code>[[/vgs/]]</code> | |
− | + | * Scan commands: <code>[[/pvscan/]]</code><ref>http://man7.org/linux/man-pages/man8/pvscan.8.html</ref>, <code>[[/vgscan/]]</code> | |
− | * Ls commands: <code>[[pvs]]</code>, <code>[[lvs]]</code><ref>http://man7.org/linux/man-pages/man8/lvs.8.html</ref>, <code>[[vgs]]</code> | + | * PV commands: <code>[[/pvdisplay/]]</code><ref>http://man7.org/linux/man-pages/man8/pvdisplay.8.html</ref>, <code>pvresize</code>, <code>[[/pvscan/]]</code>, <code>[[/pvcreate/]]</code> or <code>[[/pvcreate/]] -vv</code> |
− | * Scan commands: <code>[[pvscan]]</code><ref>http://man7.org/linux/man-pages/man8/pvscan.8.html</ref>, <code>[[vgscan]]</code> | + | * LV commands: <code>[[/lvcreate/]]</code><ref>http://man7.org/linux/man-pages/man8/lvcreate.8.html</ref>, [[lvconvert]] |
− | * PV commands: <code>[[pvdisplay]]</code><ref>http://man7.org/linux/man-pages/man8/pvdisplay.8.html</ref>, <code>pvresize</code>, <code>[[pvscan]]</code>, <code>[[pvcreate]]</code> or <code>[[pvcreate]] -vv</code> | + | * VG commands: <code>[[/vgdisplay/]]</code>, <code>[[/vgcreate/]]</code>, <code>vgcfgbackup</code>, <code>[[/vgscan/]]</code> |
− | * LV commands: <code>[[lvcreate]]</code><ref>http://man7.org/linux/man-pages/man8/lvcreate.8.html</ref>, [[lvconvert]] | + | * LVM commands: <code>lvm dumpconfig</code> |
− | * VG commands: <code>[[vgdisplay]]</code>, <code>[[vgcreate]]</code>, <code> | ||
− | * LVM commands: <code> | ||
=== Advanced commands === | === Advanced commands === | ||
* <code>lvchange</code><ref>http://man7.org/linux/man-pages/man8/lvchange.8.html</ref> — Change attributes of the Logical Volume Manager. | * <code>lvchange</code><ref>http://man7.org/linux/man-pages/man8/lvchange.8.html</ref> — Change attributes of the Logical Volume Manager. | ||
− | * <code> | + | * <code>lvmdiskscan</code> — Scan for all devices visible to LVM2. |
− | * <code> | + | * <code>lvmdump</code> — Create lvm2 information dumps for diagnostic purposes. |
== Activities == | == Activities == | ||
=== Basic === | === Basic === | ||
# Read StackOverflow LVMs questions: https://superuser.com/questions/tagged/lvm?tab=Votes | # Read StackOverflow LVMs questions: https://superuser.com/questions/tagged/lvm?tab=Votes | ||
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# Configure an [[Linux Administration/Devices and Filesystems/LVM|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 | # Configure an [[Linux Administration/Devices and Filesystems/LVM|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 | ||
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Before doing these exercises make your you have a backup of your data. | 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 | # 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 | ||
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== See also == | == See also == | ||
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* [[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 |
− | * [[Ansible]] LV module: https://docs.ansible.com/ansible/latest/modules/lvol_module.html#lvol-module | + | * [[KVM]] |
− | + | * [[DevOps/Ansible|Ansible]] LV module: https://docs.ansible.com/ansible/latest/modules/lvol_module.html#lvol-module | |
− | * [[ | + | * [[dmsetup]] |
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