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Created instructions for storing AppVMs on secondary drives.

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---
layout: doc
title: SecondaryStorage
permalink: /doc/SecondaryStorage/
redirect_from: /wiki/SecondaryStorage/
---
Storing AppVMs on Secondary Drives
==================================
Suppose you have a fast but small primary SSD and a large but slow secondary
HDD. You want to store a subset of your AppVMs on the HDD. In dom0:
1. `# mv /var/lib/qubes/appvms/my-new-appvm
/path/to/secondary/drive/my-new-appvm`
2. `# ln -s /path/to/secondary/drive/my-new-appvm /var/lib/qubes/appvms/`
Now, `my-new-appvm` will behave as if it were still stored on the primary SSD
(except that it will probably be slower, since it's actually stored on the
secondary HDD).
Known Issues
------------
* The above procedure does **not** interfere with [Qubes Backup][]. However,
attempting to symlink a `private.img` file (rather than the whole AppVM
directory) is known to prevent the `private.img` file from being backed up.
The same problem may occur if the above procedure is attempted on a
[TemplateVM][]. [[1]]
* After implementing the above procedure, starting `my-new-appvm` will cause
dom0 notifications to occur stating that loop devices have been attached to
dom0. This is normal. (No untrusted devices are actually being mounted to
dom0.) Do not attempt to detach these disks. (They will automatically be
detached when you shut down the AppVM.) [[2]]
[Qubes Backup]: https://www.qubes-os.org/doc/BackupRestore/
[TemplateVM]: https://www.qubes-os.org/doc/Templates/
[1]: https://groups.google.com/d/topic/qubes-users/EITd1kBHD30/discussion
[2]: https://groups.google.com/d/topic/qubes-users/nDrOM7dzLNE/discussion

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UserDoc.md
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@ -24,6 +24,7 @@ Qubes User Documentation
2. [XFCE Installation in dom0](/doc/UserDoc/XFCE/)
3. [Installing ZFS in Qubes](/doc/ZFS/)
4. [Configuring YubiKey for user authentication](/doc/YubiKey/)
5. [Storing AppVMs on Secondary Drives](/doc/SecondaryStorage/)
7. External Links
1. [Customizing the GUI experience with KDE](https://groups.google.com/d/topic/qubes-users/KhfzF19NG1s/discussion)