Manage Logical Volume in RHEL - RHCSA (RH134).pdf

Manage Logical Volume in RHEL - RHCSA (RH134).pdf

• 1.
  Manage Logical Volumes
• 2.
  Logical Volume Management(LVM) Abstractsphysical storage, enabling the creation of flexible logical volumes Purpose: Simplify storage management by allowing easy resizing and allocation of disk space Source: 1.3. LVM Architecture Overview | Red Hat Product Documentation
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  ● Physical Volumes(PVs): Actual disks or partitions ● Volume Groups (VGs): Collection of physical volumes combined into a single storage pool which can be managed together ● Logical Volumes (LVs): Virtual partitions created from the volume group which are used by the operating system Components of LVM
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  Source: Volume Management(helios.de)
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  Add Disk andCreate LVM Partition Pre-requisite: Create a partition on a disk before following these commands Step 1: Change the partition type from ‘Linux’ to ‘Linux LVM’ just after partition is created ● Command: t ‘8e’ Note: (‘8e’ is hex code associated with LVM)
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  Step 2: Installthe 'lvm2' package on the machine ● Command: yum install lvm2 Step 3: Create the physical volume ● Command: pvcreate <partition-name>
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  Step 4: Createthe volume group ● Command: vgcreate <volume-group-name> <partition-name>
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  Step 5: Createthe logical volume ● Command: lvcreate-n <logical-volume-name>--size <size> <volume-group-name>
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  Step 6: Formatthis disk and assign file system to it ● Command: mkfs.xfs <logical-volume-path> Step 7: Mount this disk to a drive ● Command: mount <logical-volume-path> <directory-name>
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  Extend existing diskusing LVM Pre-requisite: Create another disk partition (type: linux > linux LVM) Extend existing volume group to new partition ● Command: vgextend <existing-volume-group> <partition-name>
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  Extend the logicalvolume ● Command: lvextend-L+<size-to-extend> <logical-volume-path> Extend the file system ● Command: xfs_growfs <logical-volume-path>