Guest Disk Resize SOP: Difference between revisions

Revision as of 03:17, 13 August 2009

Shortcut: ISOP:DRESIZE

Resize disks in our Xen guests

Owner: Fedora Infrastructure Team

Contact: #fedora-admin, sysadmin-main

Location: PHX, Tummy, ibiblio, Telia, OSUOSL

Servers: All xen servers

Purpose: Resize guest disks

SSH to the xen server and resize the guest's logical volume. If you want to be extra careful, make a snapshot of the LV first:

lvcreate -n [guest name]-snap -L 10G -s /dev/VolGroup00/[guest name] # Optional, but always good to be careful

lvresize -L [new total size]G /dev/VolGroup00/[guest name]

Shutdown the guest and then start it up again:

xm shutdown -w [guest name]

xm create [guest name]

Login into the guest:
```
xm console [guest name]
```
On the guest, run
```
fdisk /dev/xvda
```
Delete the third partition (the LVM partition on the guest) and recreate it with the maximum size. Make sure to set its type to LVM.
Run partprobe:
```
partprobe
```
Check the size of the third partition:
```
fdisk -l /dev/xvda3
```
If this still reflects the old size, then reboot the guest and verify that its size changed correctly when it comes up again.
Login to the guest again, and run
```
pvresize /dev/xvda3
```
A vgs should now show the new size. Use lvresize to resize the root lv:
```
lvresize -L [new root partition size]G /dev/GuestVolGroup00/root
```
Finally, resize the root partition:
```
resize2fs /dev/GuestVolGroup00/root
```
, verify that everything worked out, and delete the snapshot you made if you made one.

@@ Line 18: / Line 18: @@
 == How to do it ==
-# SSH to the xen server and resize the guest's logical volume: <pre>lvresize -L [new total size]G /dev/VolGroup00/[guest name]</pre>
+# SSH to the xen server and resize the guest's logical volume.   If you want to be extra careful, make a snapshot of the LV first: <pre>lvcreate -n [guest name]-snap -L 10G -s /dev/VolGroup00/[guest name] # Optional, but always good to be careful</pre><pre>lvresize -L [new total size]G /dev/VolGroup00/[guest name]</pre>
 # Shutdown the guest and then start it up again: <pre>xm shutdown -w [guest name]</pre><pre>xm create [guest name]</pre>
 # Login into the guest: <pre>xm console [guest name]</pre>
@@ Line 27: / Line 27: @@
 # Login to the guest again, and run <pre>pvresize /dev/xvda3</pre>
 # A vgs should now show the new size.  Use lvresize to resize the root lv: <pre>lvresize -L [new root partition size]G /dev/GuestVolGroup00/root</pre>
-# Finally, resize the root partition: <pre>resize2fs /dev/GuestVolGroup00/root</pre> and verify that everything worked out.
+# Finally, resize the root partition: <pre>resize2fs /dev/GuestVolGroup00/root</pre>, verify that everything worked out, and delete the snapshot you made if you made one.