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Chapter 16. Floating Disks
16.1. Floating Disk Elements
The
disks collection provides information about all disks in a Red Hat Enterprise Virtualization environment. A user attaches and detaches disks from any virtual machine and floats them between virtual machines. An API user accesses this information through the rel="disks" link obtained from the entry point URI.
The following table shows specific elements contained in a
disks resource representation.
| Element | Type | Description | Properties |
|---|---|---|---|
link rel="statistics" | relationship | A link to the statistics sub-collection for a virtual machine's disk statistics. | 
|
image_id | GUID | A reference to the virtual machine image stored on the defined storage domain. |
|
storage_domains | Complex | The storage domains associated with this disk. Each storage_domain element contains an id attribute with the associated storage domain's GUID. Update this element with POST to perform live migration of a disk from one data storage domain to another. | 
|
size | integer | Size of the disk in bytes. | 
|
provisioned_size | integer | The provisioned size of the disk in bytes. |
|
actual_size | integer | Actual size of the disk in bytes. |
|
status | One of illegal, invalid, locked or ok | The status of the disk device. These states are listed in disk_states under capabilities. |
|
interface | enumerated | The type of interface driver used to connect to the disk device. A list of enumerated values is available in capabilities. | |
format | enumerated | The underlying storage format. A list of enumerated values is available in capabilities. Copy On Write (COW) allows snapshots, with a small performance overhead. Raw does not allow snapshots, but offers improved performance. |
|
sparse | Boolean: true or false | true if the physical storage for the disk should not be preallocated. |
|
bootable | Boolean: true or false | true if this disk is to be marked as bootable. | |
shareable | Boolean: true or false | true to share the disk with multiple virtual machines. | |
wipe_after_delete | Boolean: true or false | true if the underlying physical storage for the disk should be zeroed when the disk is deleted. This increases security but is a more intensive operation and may prolong delete times. | |
propagate_errors | Boolean: true or false | true if disk errors should not cause virtual machine to be paused and, instead, disk errors should be propagated to the guest OS. | |
quota id= | GUID | Sets a quota for the disk. | |
lunStorage | complex | A reference to a direct LUN mapping for storage usage. Requires a storage element that contains iSCSI or FCP device details. |
|
active | Boolean | Defines if the disk is connected to the virtual machine. |
|
Important
Search queries for disks based upon name require the
alias search parameter instead of name.
