40 lines
1.5 KiB
Markdown
40 lines
1.5 KiB
Markdown
To work with lvm make sure lvm packages are installed on your system. If you
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are adding an lvm partition manually follow the steps below.
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Make sure there's enough unallocated space. Figure out the extent size, lets
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say **8M** chunks and we'll go for **100** of these at least. Extents are the smallest
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divisible units in a lvm file system.
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*** Create LVM volume group and a logical volume from a normal partition ***
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```
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lsblk # identify device and partition
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fdisk /dev/sda # '/dev/sda' is the device we'll be working with
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# use n flag to create new partition
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# use t flag to designate the new partition as 'lvm'
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# use w to sync all changes to disk
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vgcreate -s 8M volume_name /dev/sda6 # -s specifies the extent size of 8M
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lvcreate -n scratch -l 100 /dev/volume_name # -n for name, -l Num of Extents
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mkfs.ext4 /dev/volume_name/scratch # formats the logical volume to ext4
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```
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After volume is created, it needs to be mounted. You can simply create
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a mountpoint `mkdir /scratch` or wherever, then edit **/etc/fstab** to append
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the volume likes so:
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```
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/dev/volume_name/scratch /scratch ext4 defaults 0 0
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```
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If there any doubts, man vgcreate or man lvcreate are super helpful. The beauty
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of lvm is its flexibility to resize beyond the restrictions of one or many
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physical volumes
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physical volumes -> volume group -> logical volumes
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We can use lvextend to add space to logical volume like so:
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```
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lvextend -r -L +1G /dev/volume_name/scratch
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```
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**lvresize** adds more flexibility allowing you to shrink the volume.
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