Manage volumes
A volume is a detachable block storage device, similar to a
USB hard drive. You can attach a volume to only one instance.
To create and manage volumes, you use a combination of nova
and cinder client commands.
This example creates a volume named
my-new-volume based on an image.
Migrate a volume
As an administrator, you can migrate a volume with its
data from one location to another in a manner that is
transparent to users and workloads. Only detached volumes
with no snapshots can be migrated.
Possible use cases for data migration:
Bring down a physical storage device for
maintenance without disrupting
workloads.
Modify the properties of a volume.
Free up space in a thinly-provisioned back
end.
Migrate a volume, as follows:
$ cinder migrate volumeID destinationHost --force-host-copy=True|False
Where --force-host-copy=True forces
the generic host-based migration mechanism and bypasses
any driver optimizations.
If the volume is in use or has snapshots, the
specified host destination cannot accept the
volume.
If the user is not an administrator, the migration
fails.
Create a volume
List images, and note the ID of the image to use
for your volume:
$ nova image-list
+--------------------------------------+---------------------------------+--------+--------------------------------------+
| ID | Name | Status | Server |
+--------------------------------------+---------------------------------+--------+--------------------------------------+
| 397e713c-b95b-4186-ad46-6126863ea0a9 | cirros-0.3.1-x86_64-uec | ACTIVE | |
| df430cc2-3406-4061-b635-a51c16e488ac | cirros-0.3.1-x86_64-uec-kernel | ACTIVE | |
| 3cf852bd-2332-48f4-9ae4-7d926d50945e | cirros-0.3.1-x86_64-uec-ramdisk | ACTIVE | |
| 7e5142af-1253-4634-bcc6-89482c5f2e8a | myCirrosImage | ACTIVE | 84c6e57d-a6b1-44b6-81eb-fcb36afd31b5 |
| 89bcd424-9d15-4723-95ec-61540e8a1979 | mysnapshot | ACTIVE | f51ebd07-c33d-4951-8722-1df6aa8afaa4 |
+--------------------------------------+---------------------------------+--------+--------------------------------------+
List the availability zones, and note the ID of
the availability zone in which to create your
volume:
$ nova availability-zone-list
+-----------------------+----------------------------------------+
| Name | Status |
+-----------------------+----------------------------------------+
| internal | available |
| |- devstack-grizzly | |
| | |- nova-conductor | enabled :-) 2013-07-25T16:50:44.000000 |
| | |- nova-consoleauth | enabled :-) 2013-07-25T16:50:44.000000 |
| | |- nova-scheduler | enabled :-) 2013-07-25T16:50:44.000000 |
| | |- nova-cert | enabled :-) 2013-07-25T16:50:44.000000 |
| | |- nova-network | enabled :-) 2013-07-25T16:50:44.000000 |
| nova | available |
| |- devstack-grizzly | |
| | |- nova-compute | enabled :-) 2013-07-25T16:50:39.000000 |
+-----------------------+----------------------------------------+
Create a volume with 8 GBs of space. Specify the
availability zone and image:
$ cinder create 8 --display-name my-new-volume --image-id 397e713c-b95b-4186-ad46-6126863ea0a9 --availability-zone nova
+---------------------+--------------------------------------+
| Property | Value |
+---------------------+--------------------------------------+
| attachments | [] |
| availability_zone | nova |
| bootable | false |
| created_at | 2013-07-25T17:02:12.472269 |
| display_description | None |
| display_name | my-new-volume |
| id | 573e024d-5235-49ce-8332-be1576d323f8 |
| image_id | 397e713c-b95b-4186-ad46-6126863ea0a9 |
| metadata | {} |
| size | 8 |
| snapshot_id | None |
| source_volid | None |
| status | creating |
| volume_type | None |
+---------------------+--------------------------------------+
To verify that your volume was created
successfully, list the available volumes:
$ cinder list
+--------------------------------------+-----------+-----------------+------+-------------+----------+-------------+
| ID | Status | Display Name | Size | Volume Type | Bootable | Attached to |
+--------------------------------------+-----------+-----------------+------+-------------+----------+-------------+
| 573e024d-5235-49ce-8332-be1576d323f8 | available | my-new-volume | 8 | None | true | |
| bd7cf584-45de-44e3-bf7f-f7b50bf235e3 | available | my-bootable-vol | 8 | None | true | |
+--------------------------------------+-----------+-----------------+------+-------------+----------+-------------+
If your volume was created successfully, its
status is available. If its
status is error, you might have
exceeded your quota.
Attach a volume to an instance
Attach your volume to a server:
$ nova volume-attach 84c6e57d-a6b1-44b6-81eb-fcb36afd31b5 573e024d-5235-49ce-8332-be1576d323f8 /dev/vdb
+----------+--------------------------------------+
| Property | Value |
+----------+--------------------------------------+
| device | /dev/vdb |
| serverId | 84c6e57d-a6b1-44b6-81eb-fcb36afd31b5 |
| id | 573e024d-5235-49ce-8332-be1576d323f8 |
| volumeId | 573e024d-5235-49ce-8332-be1576d323f8 |
+----------+--------------------------------------+
Note the ID of your volume.
Show information for your volume:
$ cinder show 573e024d-5235-49ce-8332-be1576d323f8
+------------------------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| Property | Value |
+------------------------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| attachments | [{u'device': u'/dev/vdb', u'server_id': u'84c6e57d-a6b1-44b6-81eb-fcb36afd31b5', u'id': u'573e024d-5235-49ce-8332-be1576d323f8', u'volume_id': u'573e024d-5235-49ce-8332-be1576d323f8'}] |
| availability_zone | nova |
| bootable | true |
| created_at | 2013-07-25T17:02:12.000000 |
| display_description | None |
| display_name | my-new-volume |
| id | 573e024d-5235-49ce-8332-be1576d323f8 |
| metadata | {} |
| os-vol-host-attr:host | devstack-grizzly |
| os-vol-tenant-attr:tenant_id | 66265572db174a7aa66eba661f58eb9e |
| size | 8 |
| snapshot_id | None |
| source_volid | None |
| status | in-use |
| volume_image_metadata | {u'kernel_id': u'df430cc2-3406-4061-b635-a51c16e488ac', u'image_id': u'397e713c-b95b-4186-ad46-6126863ea0a9', u'ramdisk_id': u'3cf852bd-2332-48f4-9ae4-7d926d50945e', u'image_name': u'cirros-0.3.1-x86_64-uec'} |
| volume_type | None |
+------------------------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
The output shows that the volume is attached to
the server with ID
84c6e57d-a6b1-44b6-81eb-fcb36afd31b5,
is in the nova availability zone, and is
bootable.
Resize a volume
To resize your volume, you must first detach it
from the server.
To detach the volume from your server, pass the
server ID and volume ID to the command:
$ nova volume-detach 84c6e57d-a6b1-44b6-81eb-fcb36afd31b5 573e024d-5235-49ce-8332-be1576d323f8
The volume-detach command
does not return any output.
List volumes:
$ cinder list
+--------------------------------------+-----------+-----------------+------+-------------+----------+-------------+
| ID | Status | Display Name | Size | Volume Type | Bootable | Attached to |
+--------------------------------------+-----------+-----------------+------+-------------+----------+-------------+
| 573e024d-5235-49ce-8332-be1576d323f8 | available | my-new-volume | 8 | None | true | |
| bd7cf584-45de-44e3-bf7f-f7b50bf235e3 | available | my-bootable-vol | 8 | None | true | |
+--------------------------------------+-----------+-----------------+------+-------------+----------+-------------+
Note that the volume is now available.
Resize the volume by passing the volume ID and
the new size (a value greater than the old one) as
parameters:
$ cinder extend 573e024d-5235-49ce-8332-be1576d323f8 10
The extend command does not
return any output.
Delete a volume
To delete your volume, you must first detach it
from the server.
To detach the volume from your server and check
for the list of existing volumes, see steps 1 and
2 mentioned in .
Delete the volume:
$ cinder delete my-new-volume
The delete command does not return any
output.
List the volumes again, and note that the status
of your volume is
deleting:
$ cinder list
+--------------------------------------+-----------+-----------------+------+-------------+----------+-------------+
| ID | Status | Display Name | Size | Volume Type | Bootable | Attached to |
+--------------------------------------+-----------+-----------------+------+-------------+----------+-------------+
| 573e024d-5235-49ce-8332-be1576d323f8 | deleting | my-new-volume | 8 | None | true | |
| bd7cf584-45de-44e3-bf7f-f7b50bf235e3 | available | my-bootable-vol | 8 | None | true | |
+--------------------------------------+-----------+-----------------+------+-------------+----------+-------------+
When the volume is fully deleted, it disappears
from the list of volumes:
$ cinder list
+--------------------------------------+-----------+-----------------+------+-------------+----------+-------------+
| ID | Status | Display Name | Size | Volume Type | Bootable | Attached to |
+--------------------------------------+-----------+-----------------+------+-------------+----------+-------------+
| bd7cf584-45de-44e3-bf7f-f7b50bf235e3 | available | my-bootable-vol | 8 | None | true | |
+--------------------------------------+-----------+-----------------+------+-------------+----------+-------------+
Transfer a volume
You can transfer a volume from one owner to another by
using the cinder transfer* commands.
The volume donor, or original owner, creates a transfer
request and sends the created transfer ID and
authorization key to the volume recipient. The volume
recipient, or new owner, accepts the transfer by using the
ID and key.
Use cases include:
Create a custom bootable volume or a volume
with a large data set and transfer it to the
end customer.
For bulk import of data to the cloud, the
data ingress system creates a new Block
Storage volume, copies data from the physical
device, and transfers device ownership to the
end user.
Create a volume transfer request
While logged in as the volume donor, list
available volumes:
$ cinder list
+--------------------------------------+-----------+--------------+------+-------------+----------+-------------+
| ID | Status | Display Name | Size | Volume Type | Bootable | Attached to |
+--------------------------------------+-----------+--------------+------+-------------+----------+-------------+
| 72bfce9f-cacf-477a-a092-bf57a7712165 | error | None | 1 | None | false | |
| a1cdace0-08e4-4dc7-b9dc-457e9bcfe25f | available | None | 1 | None | false | |
+--------------------------------------+-----------+--------------+------+-------------+----------+-------------+
As the volume donor, request a volume
transfer authorization code for a specific
volume:
$ cinder transfer-create volumeID
The volume must be in an ‘available’ state
or the request will be denied. If the transfer
request is valid in the database (that is, it
has not expired or been deleted), the volume
is placed in an awaiting
transfer state. For
example:
$ cinder transfer-create a1cdace0-08e4-4dc7-b9dc-457e9bcfe25f
+------------+--------------------------------------+
| Property | Value |
+------------+--------------------------------------+
| auth_key | b2c8e585cbc68a80 |
| created_at | 2013-10-14T15:20:10.121458 |
| id | 6e4e9aa4-bed5-4f94-8f76-df43232f44dc |
| name | None |
| volume_id | a1cdace0-08e4-4dc7-b9dc-457e9bcfe25f |
+------------+--------------------------------------+
Optionally, you can specify a name for
the transfer by using the
--display-name
displayName
parameter.
Send the volume transfer ID and
authorization key to the new owner (for
example, by email).
View pending transfers:
$ cinder transfer-list
+--------------------------------------+--------------------------------------+------+
| ID | VolumeID | Name |
+--------------------------------------+--------------------------------------+------+
| 6e4e9aa4-bed5-4f94-8f76-df43232f44dc | a1cdace0-08e4-4dc7-b9dc-457e9bcfe25f | None |
+--------------------------------------+--------------------------------------+------+
After the volume recipient, or new owner,
accepts the transfer, you can see that the
transfer is no longer available:
$ cinder transfer-list
+----+-----------+------+
| ID | Volume ID | Name |
+----+-----------+------+
+----+-----------+------+
Accept a volume transfer request
As the volume recipient, you must first
obtain the transfer ID and authorization key
from the original owner.
Display the transfer request details using
the ID:
$ cinder transfer-show transferID
For example:
$ cinder transfer-show 6e4e9aa4-bed5-4f94-8f76-df43232f44dc
+------------+--------------------------------------+
| Property | Value |
+------------+--------------------------------------+
| created_at | 2013-10-14T15:20:10.000000 |
| id | 6e4e9aa4-bed5-4f94-8f76-df43232f44dc |
| name | None |
| volume_id | a1cdace0-08e4-4dc7-b9dc-457e9bcfe25f |
+------------+--------------------------------------+
Accept the request:
$ cinder transfer-accept transferID authKey
For example:
$ cinder transfer-accept 6e4e9aa4-bed5-4f94-8f76-df43232f44dc b2c8e585cbc68a80
+-----------+--------------------------------------+
| Property | Value |
+-----------+--------------------------------------+
| id | 6e4e9aa4-bed5-4f94-8f76-df43232f44dc |
| name | None |
| volume_id | a1cdace0-08e4-4dc7-b9dc-457e9bcfe25f |
+-----------+--------------------------------------+
If you do not have a sufficient quota
for the transfer, the transfer is
refused.
Delete a volume transfer
List available volumes and their
statuses:
$ cinder list
+--------------------------------------+-------------------+--------------+------+-------------+----------+-------------+
| ID | Status | Display Name | Size | Volume Type | Bootable | Attached to |
+--------------------------------------+-------------------+--------------+------+-------------+----------+-------------+
| 72bfce9f-cacf-477a-a092-bf57a7712165 | error | None | 1 | None | false | |
| a1cdace0-08e4-4dc7-b9dc-457e9bcfe25f | awaiting-transfer | None | 1 | None | false | |
+--------------------------------------+-------------------+--------------+------+-------------+----------+-------------+
Find the matching transfer ID:
$ cinder transfer-list
+--------------------------------------+--------------------------------------+------+
| ID | VolumeID | Name |
+--------------------------------------+--------------------------------------+------+
| a6da6888-7cdf-4291-9c08-8c1f22426b8a | a1cdace0-08e4-4dc7-b9dc-457e9bcfe25f | None |
+--------------------------------------+--------------------------------------+------+
Delete the volume:
$ cinder transfer-delete transferID
For example:
$ cinder transfer-delete a6da6888-7cdf-4291-9c08-8c1f22426b8a
The transfer list is now empty and the
volume is again available for transfer:
$ cinder transfer-list
+----+-----------+------+
| ID | Volume ID | Name |
+----+-----------+------+
+----+-----------+------+
$ cinder list
+--------------------------------------+-----------+--------------+------+-------------+----------+-------------+
| ID | Status | Display Name | Size | Volume Type | Bootable | Attached to |
+--------------------------------------+-----------+--------------+------+-------------+----------+-------------+
| 72bfce9f-cacf-477a-a092-bf57a7712165 | error | None | 1 | None | false | |
| a1cdace0-08e4-4dc7-b9dc-457e9bcfe25f | available | None | 1 | None | false | |
+--------------------------------------+-----------+--------------+------+-------------+----------+-------------+