vmm drivers

[FlorianHeigl]

Hi @kvaps in https://forum.opennebula.io/t/using-datastores-with-zfs/3075/7 you wrote:

Also you should know that the custom system storage feature has become available 
since version OpenNebula 5.0, and currently not developed for my zfs-addon.
If anyone want to develop it, need to write 2 new files:
/vmm/kvm/restore.zfs and /vmm/kvm/save.zfs

Can you tell me / us a slight bit more about that?

I would like to try to write them if it's useful & important.
But I don't exactly understand the role and how critical it is.

Which of these are true?

relevance	description	classification
1 - matters	This is for suspending/resume of VMs in general?	core functionality
2 - matters	This is for making runtime snapshots of disks	core functionality
3 - someone should do it	This is for cross-DS migration	higher level feature
4 - i don't wanna touch	This is enabling something for wild edge cases where someone multi-attaches one zpool to multiple hosts(*)	core functionality only used in 1 case

(*)As in the thread linked. I don't like it too much since it's a layering violation. ONE ends up the manager of the zvols.
i would rather not work on that even when granting that it might be someone who knows more than just the average zfs-forum-poster-gist can do with good procedures)