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Add useful examples to create/resize a lvm[-thin] pool.

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Wolfgang Link 2016-10-12 14:23:33 +02:00 committed by Dietmar Maurer
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local-lvm.adoc
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@ -40,6 +40,12 @@ data:: This volume uses LVM-thin, and is used to store VM
images. LVM-thin is preferable for this task, because it offers images. LVM-thin is preferable for this task, because it offers
efficient support for snapshots and clones. efficient support for snapshots and clones.
For {pve} versions up to 4.1, the installer creates a Logical Volume
called ``data'' which is mounted at `/var/lib/vz`
Starting from 4.2 the Logical Volume ``data'' is a LVM thin volume, used
for block based storage of guest systems, and `/var/lib/vz` is simply a
directory on the root file system.
Hardware Hardware
~~~~~~~~ ~~~~~~~~
@ -57,3 +63,66 @@ Bootloader
We install two boot loaders by default. The first partition contains We install two boot loaders by default. The first partition contains
the standard GRUB boot loader. The second partition is an **E**FI **S**ystem the standard GRUB boot loader. The second partition is an **E**FI **S**ystem
**P**artition (ESP), which makes it possible to boot on EFI systems. **P**artition (ESP), which makes it possible to boot on EFI systems.
Creating a Volume Group
~~~~~~~~~~~~~~~~~~~~~~~
Let's assume we have an empty disk `/dev/sdb`, onto which we want to
create a Volume Group named ``vmdata''.
First create a partition.
# sgdisk -N 1 /dev/sdb
Create a **P**hysical **V**olumes (PV) without confirmation and 250K
metadatasize.
# pvcreate --metadatasize 250k -y -ff /dev/sdb1
Create a **V**olume **G**roup (VG) named ``vmdata'' on `/dev/sdb1`
# vgcreate vmdata /dev/sdb1
Creating an extra LV for `/var/lib/vz`
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
This can be easily done by creating a new thin LV.
# lvcreate -n <Name> -V <Size[M,G,T]> <VG>/<LVThin_pool>
A real world example:
# lvcreate -n vz -V 10G pve/data
Now a filesystem must be created on the LV.
# mkfs.ext4 /dev/data/vz
At last this has to be mounted.
WARNING: be sure that `/var/lib/vz` is empty. On a default installation it's not.
To make it always accessible add the following line in `/etc/fstab`.
# echo '/dev/pve/vz /var/lib/vz ext4 defaults 0 2' >> /etc/fstab
Resizing the thin pool
~~~~~~~~~~~~~~~~~~~~~~
NOTE: When extending the data pool, the metadata pool must be extended with it.
Resize the LV and the metadata pool can be achieved with the following command.
# lvresize --size +<size[\M,G,T]> --poolmetadatasize +<size[\M,G]> <VG>/<LVThin_pool>
Create a LVM-Thin pool
~~~~~~~~~~~~~~~~~~~~~~
A thin pool has to be created on top of a volume group.
How to create a Volume Group see Section LVM.
# lvcreate -L 80G -T -n vmstore vmdata