Logical Volume Manager (LVM)
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| An alternative method to manage partitions that give more flexibility in allocating storage on a system | Logical Volume Manager (LVM)
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| Instead of /dev/sda, Logical volumes can be identified by: | Descriptive names (such as research or marketing)
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| While the logical volumes are still mounted and running you can: | Resize and move
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| Command to initialize a physical volume for later use by the LVM | pvcreate
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| Example: Create a PHYSICAL volume on the second hard disk | pvcreate /dev/sdb
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| Scan all disks for PHYSICAL volumes and display the results (and their associated groups) | pvscan
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| Display a PHYSICAL volume that gives name, pv size etc | pvdisplay
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| Create a new VOLUME group | vgcreate
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| Adds one or more initialized physical volumes to an EXISTING volume group to extend its size | vgextend
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| Example: Add the third hard disk (physical volume) to a volume group named "Sales" | vgextend Sales /dev/sdc
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| Display created volume groups | vgdisplay
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| Create a new LOGICAL volume in a volume group | lvcreate
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| Specify the logical volume size | lvcreate -L
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| Specify the logical volume name | lvcreate -n
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| Example: Create a 3 Terabyte logical volume, named "figures" on the "sales" volume group | lvcreate -L 2T -n figures sales
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| Scans all volume groups or supported LVM block devices in the system for logical volumes and display the results | lvscan
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| Extends the size of a volume group | lvextend
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| lvextend Options: Specify the new size of the volume | lvextend -L +size
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| Example: Extend the data logical volume to 30 Gigabytes | lvextend -L 30G data
- (without the -L option the volume will increase by the amount of free space on the physical volume)
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| lvextend Options: specify which logical volume to extend | lvextend {logicalvolume}
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| Example: Extend the Sales logical volume to all the free space on the physical volume /dev/sdd | lvextend Sales /dev/sdd
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| lvextend Options: Specify the physical volume to use fr the extension | lvextend {physicalvolume}
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