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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
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
~~~~~~~~
@ -57,3 +63,66 @@ Bootloader
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
**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