At the current time, support for changing volume type on an existing volume is not supported. However, by creating a new volume with the desired type, and copying data, we can switch between them.
For the purpose of this example we will assume:
The operating system involved in Linux, and we recommend doing this on a system which is not booted from the original volume
there is an existing volume attached to the instance and mounted on
/data
a new volume of the desired new type has been attached to the instance and
has been partitioned
has a file system created
is mounted on /mnt/data_new
We will be using rsync to perform the transfer as it allows us to maintain the volumes thin provisioned nature, and preserve the nature of any sparse files that may exist on the original disk.
The following code block is a template for you to fill in with your requirements:
rsync -avxHAXSW --numeric-ids --info=progress2 /data/ /mnt/data_new/
Where the options are:
-a : all files, with permissions, etc..
-v : verbose, mention files
-x : stay on one file system
-H : preserve hard links (not included with -a)
-A : preserve ACLs/permissions (not included with -a)
-X : preserve extended attributes (not included with -a)
-S : handle sparse files, such as virtual disks, efficiently
-W : copy files whole (w/o delta-xfer algorithm)
--info=progress2 : will show the overall progress info and transfer speed
--numeric-ids : don't map uid/gid values by user/group name
So you have been successfully using OpenStack, and now one of your volumes has started filling up. What is the best, quickest and safest way to grow the size of your volume?
The block storage service supports the live extension of volumes regardless of whether that are boot volumes or additional volumes attached to your instance.
Using the openstack command you can extend a volume by increasing the size (in GB) using the set command. In order for the command to support the live volume extension the minimum version of 3.42 for the Block Storage API needs to be given:
openstack --os-volume-api-version 3.42 volume set --size 40 9f69bb95-xxxx-xxxx-xxxx-xxxxxxxxxxxx
Locate the volume in the Dashboard under the Volumes menu and then select the Extend Volume action:
In the dialog enter the new size of the volume and click on Extend Volume
