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52 lines
2.1 KiB
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52 lines
2.1 KiB
Markdown
---
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lang: en
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layout: doc
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permalink: /doc/storage-pools/
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ref: 57
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title: Storage pools
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---
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Qubes OS R3.2 introduced the concept of storage drivers and pools. This feature
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was a first step towards a saner storage API, which is heavily rewritten in R4.
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See [here](https://dev.qubes-os.org/projects/core-admin/en/latest/qubes-storage.html)
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for documentation on storage pools in R4.
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A storage driver provides a way to store VM images in a Qubes OS system.
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Currently, the default driver is `xen` which is the default way of storing
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volume images as files in a directory tree like `/var/lib/qubes/`.
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A storage pool driver can be identified either by the driver name with the
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`driver` key or by the class name like this:
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`class=qubes.storage.xen.XenStorage`. Because R3.2 doesn't use Python
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`setup_hooks`, to actually use a short driver name for a custom storage driver,
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you have to patch `qubes-core-admin`. You can use the `class` config key
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instead, when your class is accessible by `import` in Python.
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A pool (in R3.2) is configuration information which can be referenced when
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creating a new VM. Each pool is saved in `storage.conf`. It has a name, a
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storage driver and some driver specific configuration attached.
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When installed, the system has, as you can see from the contents of
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`/etc/qubes/storage.conf`, a pool named `default`. It uses the driver `xen`. The
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default pool is special in R3.2. It will add `dir_path=/var/lib/qubes`
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configuration value from `defaults[pool_config]`, if not overwritten.
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Currently the only supported driver out of the box is `xen`. The benefit of
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pools (besides that you can write your own storage driver e.g. for Btrfs) in R3.2
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is that you can store your domains in multiple places.
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You can add a pool to `storage.conf` like this:
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```
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[foo]
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driver=xen
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dir_path=/opt/qubes-vm
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```
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Now, when creating a new VM on the command-line, you may pass the `-Pfoo`
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argument to `qvm-create` to have the VM images stored in pool `foo`. See also
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`qvm-create --help`.
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While the current API is not as clean and beautiful as the R4 API, it allows
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you to write your own storage drivers e.g. for Btrfs today.
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