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Add chapter for thin provisioning

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Emmanuel Kasper 2016-05-18 14:52:24 +02:00 committed by Dietmar Maurer
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@ -83,6 +83,23 @@ snapshots and clones.
TIP: It is possible to use LVM on top of an iSCSI storage. That way
you get a 'shared' LVM storage.
Thin provisioning
-----------------
A number of storages, and the Qemu image format `qcow2`, support _thin provisioning_.
With thin provisioning activated, only the blocks that the guest system actually use will be
written to the storage.
Say for instance you create a VM with a 32GB hard disk, and after installing the
guest system OS, the root filesystem of the VM contains 3 GB of data.
In that case only 3GB are written to the storage, even if the guest VM sees a
32GB hard drive. In this way thin provisioning allows you to create disk images
which are larger than the currently available storage blocks. You can create
large disk images for your VMs, and when the need arises, add more disks to your
storage without resizing the VMs filesystems.
All storage types which have the 'Snapshots' feature also support thin provisioning.
Storage Configuration
---------------------