The LVM Datastore 4.4
Overview
OpenNebula provides LVM support in two flavours:
- LVM: the classical OpenNebula approach.
- Shared LVM: the new approach designed to work with multiple system datastores.
Overview of LVM and Shared LVM
| LVM | Shared LVM | |
|---|---|---|
| cLVM | Requires cLVM in the worker nodes. | |
| Shared FS | Does not require a shared FS. | Requires a shared FS to be available in the frontend and in the worker nodes. |
| Image Registration | Images are registered in LV format. | Images are registered in file-format in the frontend, which are accessible by the nodes. |
| Volume Group | The datastore has a VG name associated to it. | OpenNebula dynamically selects the VG. |
| Persistent Images | Image LVs are directly used in the Virtual Machine in the Datastores's VG. | Images are dumped to newly created LVs for the VM in a dynamically selected VG. |
| Clone Images | Image LVs are cloned in the same VG | Images are dumped to newly created LVs for the VM in a dynamically selected VG. |
| Live Migration | Yes | |
| Disk Snapshots | Yes | |