Functionality

The driver extends the capabilities of the standard Cinder LVM driver.

The SDS Driver provides the ability to organize storage with shared disk space by connecting the disk along several paths.

SDS Driver also supports live and cold migration of instances.

Instance	Method	Implemented	VM On	VM Off	LV as the root-device	LV as a block-device	Comment
Snapshot	create	TRUE	TRUE	TRUE	TRUE	TRUE	Information about changed source blocks is stored only on the current host; when switching, it starts writing to the snapshot again, and incorrectly reads meta information.
Snapshot	revert_volume_to_snapshot	TRUE	only if disk umounted	TRUE	TRUE	TRUE	The GUI does not have the ability to revert an image to disk; it is available in the Cinder API. When I try to do this, I get an error with code 404. After the merge, the used snapshot is recreated.
Volume	extend	FALSE	probably only if disk umounted	TRUE	TRUE	TRUE
Snapshot	create_volume_from_snapshot	TRUE	TRUE	TRUE	TRUE	TRUE	You need to check which host has the most current snapshot. Reconnecting the target.
Snapshot	delete	TRUE	TRUE	TRUE	TRUE	TRUE	We reconnect the target, deletion occurs twice.
Volume	delete	TRUE	only if disk dettached in OS	only if disk dettached in OS	Tru	TRUE	For some reason the deletion occurs twice, the problem has not yet been investigated.
Volume	clone	FALSE	TRUE	TRUE	TRUE	TRUE	LV cloning can be done hot, but will create a temporary snapshot.