7 Known issues and limitations

The following are known issues and limitations when using Haizea with OpenNebula:

• As pointed out in this guide, Haizea has to poll OpenNebula every minute to ask if there are any new requests. Although OpenNebula 1.4 added a ``hook mechanism'' that allows actions to be carried out when certain events happen (such as sending Haizea notifications of a VM that has died, a suspend operation that finished before expected, etc.), Haizea currently does not use this hook mechanism.
• Haizea currently cannot do any image deployment with OpenNebula, and VM images are assumed to be predeployed on the physical nodes, or available on a shared NFS filesystem. Although OpenNebula includes support for interfacing with a transfer manager to handle various VM deployment scenarios, Haizea currently does not access this functionality.
• Haizea cannot enact cold migrations in OpenNebula (i.e., migrating a suspended VM to a different node if resources become available earlier on a different node than the one where the VM was suspended on). Haizea actually has all the scheduling code for this, and only the enactment "glue" is missing.