Lab 15.1: Create LVM volumes with extents

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Doel

Build a volume group with a fixed extent size and two logical volumes that are mounted at every boot.

Voordat je begint

You need an empty disk of at least 5 GiB (in this lab /dev/vdc; check with lsblk). Work as root.

Taken

Create a partition of 4 GiB of the type LVM on the disk and make it a physical volume.
Create the volume group vgfiles with an extent size of 8 MiB.
Create the logical volume lvfiles with exactly 50 extents. Format it with XFS and mount it on /files at every boot.
Create the logical volume lvdocs with the rest of the free space. Format it with ext4 and mount it on /docs at every boot.
Show the size of lvfiles in MiB and the PE size of the VG.

Controleer je werk

#pvs; vgs vgfiles; lvs vgfiles
#vgdisplay vgfiles | grep 'PE Size'
#findmnt /files; findmnt /docs
#df -h /files /docs

vgdisplay shows PE Size 8.00 MiB.
lvfiles is 400 MiB (50 × 8 MiB).
Both file systems are mounted after a reboot.

Hints

Toon de hints

fdisk type alias: lvm.
vgcreate -s 8M, lvcreate -l 50, lvcreate -l 100%FREE.
In fstab use /dev/vgfiles/lvfiles.

Oplossing

Toon de oplossing

Partition and PV.

#fdisk /dev/vdc
Command (m for help): g
Command (m for help): n          (Enter, Enter, +4G)
Command (m for help): t          (lvm)
Command (m for help): w
#pvcreate /dev/vdc1

VG with 8 MiB extents.
```
#vgcreate -s 8M vgfiles /dev/vdc1
```

lvfiles with 50 extents, XFS, fstab.

#lvcreate -n lvfiles -l 50 vgfiles
#mkfs.xfs /dev/vgfiles/lvfiles
#mkdir /files
#echo "/dev/vgfiles/lvfiles /files xfs defaults 0 0" >> /etc/fstab

lvdocs with the rest, ext4, fstab.

#lvcreate -n lvdocs -l 100%FREE vgfiles
#mkfs.ext4 /dev/vgfiles/lvdocs
#mkdir /docs
#echo "/dev/vgfiles/lvdocs /docs ext4 defaults 0 0" >> /etc/fstab
#systemctl daemon-reload; mount -a

Sizes.

#lvs --units m vgfiles
#vgdisplay vgfiles | grep 'PE Size'

Mijn notities

Nog geen notities.

Create LVM volumes with extents