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Re: boot from volume use cases
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
Salman A. Baset
Research Staff Member, IBM T. J. Watson Research Center
From: Josh Durgin <josh.durgin@xxxxxxxxxxxxx>
Date: 03/22/2012 07:25 PM
Subject: [Openstack] boot from volume use cases
Sent by: openstack-bounces+sabaset=us.ibm.com@xxxxxxxxxxxxxxxxxxx
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
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