4.5. disk

The disk resource type groups all virtual hard disk resources in a Red Hat Enterprise Virtualization environment.

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Table 4.6. Disk parameters
Name	Type	Description	Required	User Creatable	User Updatable
`--provisioned_size`	int	The reserved storage space for the disk. This space is preallocated for the disk to use, even if the disk `size` is less than the `provisioned_size`	Yes	Yes	Yes
`--interface`	string	The interface type of the disk. Either `ide` or `virtio`.	Yes	Yes	Yes
`--format`	string	The underlying storage format. Copy On Write (`cow`) allows snapshots, with a small performance overhead. Raw (`raw`) does not allow snapshots, but offers improved performance.	Yes	Yes	Yes
`--size`	int	The actual size of the disk.	No	Yes	Yes
`--sparse`	Boolean	`true` if the physical storage for the disk should not be preallocated.	No	Yes	Yes
`--bootable`	Boolean	`true` if this disk is to be marked as bootable.	No	Yes	Yes
`--shareable`	Boolean	`true` if this disk is shareable.	No	Yes	Yes
`--allow_snapshot`	Boolean	`true` if this disk allows snapshots.	No	Yes	Yes
`--propagate_errors`	Boolean	`true` if disk errors should not cause virtual machine to be paused and, instead, disk errors should be propagated to the guest OS.	No	Yes	Yes
`--wipe_after_delete`	boolean	`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.	No	Yes	Yes
`--storage_domains-storage_domain`	collection	Defines a specific storage domain for the disk.	No	Yes	No

The --storage_domains-storage_domain parameter is a collection that uses the sub-parameters in the following table.

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Table 4.7. --storage_domains-storage_domain parameters
Name	Type	Description
`storage_domain.id\|name`	string	A reference to a storage domain for the disk.

The following table lists additional disk options for resource-based commands.

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Table 4.8. Additional command options
Option	Description
`--vm-identifier`	Adds the disk to a `vm` as a sub-resource.
`--alias`	Identifies a disk name when using a `show` command. Use `--alias` instead of the `--name` parameter for disk-specific queries.

Example 4.11. Creating a new disk

[RHEVM shell (connected)]# add disk --name MyDisk --provisioned_size 8589934592 --interface virtio --format cow

[RHEVM shell (connected)]# add disk --name MyDisk --provisioned_size 8589934592 --interface virtio --format cow

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Example 4.12. Updating a storage domain

[RHEVM shell (connected)]# update disk MyDisk --shareable true

[RHEVM shell (connected)]# update disk MyDisk --shareable true

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Example 4.13. Deleting a storage domain

[RHEVM shell (connected)]# remove disk MyDisk

[RHEVM shell (connected)]# remove disk MyDisk

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The following table lists actions for a virtual machine disk resource.

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Table 4.9. Virtual machine disk actions
Action	Description
`activate`	Activate a disk on a virtual machine.
`deactivate`	Deactivate a disk on a virtual machine.