Open Stack

I am sure it has been discussed, but booting an instance from a volume
stored on SAN (similar to EBS) is clearly an important use case for private
clouds...

Best Regards,

Salman A. Baset
Research Staff Member, IBM T. J. Watson Research Center
Tel: +1-914-784-6248






From:	Josh Durgin <josh.durgin at dreamhost.com>
To:	openstack at lists.launchpad.net
Date:	03/22/2012 07:25 PM
Subject:	[Openstack] boot from volume use cases
Sent by:	openstack-bounces+sabaset=us.ibm.com at lists.launchpad.net



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.


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