Merge branch 'awokd-patch-9'

configuration/secondary-storage.md

@@ -11,33 +11,60 @@ redirect_from:
 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:
+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.
 
-1. `# mv /var/lib/qubes/appvms/my-new-appvm
-/path/to/secondary/drive/my-new-appvm`
+### R4.0 ###
 
-2. `# ln -s /path/to/secondary/drive/my-new-appvm /var/lib/qubes/appvms/`
+Qubes 4.0 is more flexible than earlier versions about placing different VMs on different disks. 
+For example, you can keep templates on one disk and AppVMs on another, without messy symlinks.
 
-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).
+Assuming you have already created a separate [volume group](https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/6/html/logical_volume_manager_administration/vg_admin#VG_create) and [thin pool](https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/6/html/logical_volume_manager_administration/thinly_provisioned_volume_creation) (not thin volume) for your HDD, first collect some information in a dom0 terminal:
 
-Known Issues
-------------
+    sudo pvs
+    sudo lvs
 
- * 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]]
+Take note of the VG and thin pool names for your HDD, then register it with Qubes:
 
- * This issue applies only to R3.1, not R3.2 or later:
-   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]]
+    # pool_name is a freely chosen pool name
+    # vg_name is LVM volume group name
+    # thin_pool_name is LVM thin pool name
+    qvm-pool --add pool_name lvm_thin -o volume_group=vg_name,thin_pool=thin_pool_name
+    
+Now, you can create qubes in that pool:
+
+    qvm-create -P pool_name --label red vmname
+
+It isn't possible to directly migrate an existing qube to the new pool, but you can clone it there, then remove the old one:
+
+    qvm-clone -P pool_name old_name new_name
+    qvm-remove old_name
+
+If that was a template, or other qube referenced elsewhere (NetVM or such), you will need to adjust those references manually after moving.
+For example:
+
+    qvm-prefs appvm_based_on_old_name_template template new_name
+
+In theory, you can still use file-based disk images ("file" pool driver), but it lacks some features such as you won't be able to do backups without shutting down the qube.
+
+### R3.2 ###
+
+In dom0:
+
+    mv /var/lib/qubes/appvms/my-new-appvm /path/to/secondary/drive/my-new-appvm
+    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).
+
+ * 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]: /doc/BackupRestore/
 [TemplateVM]: /doc/Templates/