← Back to team overview

openstack team mailing list archive

boot from volume use cases

 

At the last couple volumes meetings, there was some discussion of the
desired behaviors of nova's boot from volume functionality. There were
a few use cases discussed, but there are probably plenty we didn't
think of, so it would be useful to get input from a larger audience.

What use cases for boot from volume are people interested in, and
which should nova support?

Here are a few use cases:

  1) I use an existing instance to manually create a bootable volume
     containing an OS there is no image for (and I cannot create an
     image). I boot the new OS from the volume I created.

  2) I create a bunch of new instances that have no ephemeral disks,
     but are all based on the same image. The data from the image is
     copied to a new volume for each new instance.

  3) I have an instance that has no ephemeral disks, and stores
     everything in a volume. I take periodic snapshots of the
     volume. Later, my original instance becomes corrupted, and I want
     to restore from the last known good snapshot I took. I boot a new
     instance from a new volume created by cloning from the last
     good snapshot.



Follow ups