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Hi Kevin,

There are a few blueprints in Trove that might address your use case.  See https://blueprints.launchpad.net/trove/+spec/snapshot-as-backup-strategy or maybe https://blueprints.launchpad.net/trove/+spec/volume-delete-on-terminate .  If neither is entirely correct, please feel free to submit a new one.

Thanks!
Peter

From: Fox, Kevin M [mailto:Kevin.Fox at pnnl.gov]
Sent: June-28-16 7:10 PM
To: OpenStack Development Mailing List (not for usage questions); Ali Adil
Subject: Re: [openstack-dev] Change in openstack/trove[master]: Ophaned Volume Not Removed on Instance Delete

To me, one of the benefits of cinder is the ability to have the volume outlast the vm. So, for example, if you knew a yum upgrade went bad on the vm, but the db data is safe, it would be nice to be able to just delete the vm and have trove relaunch using the existing volume, not having to import all the data again. Or the host it was running on died but the volume is ok. It would be very nice if Trove supported this use case.

Thanks,
Kevin
________________________________
From: Peter Stachowski [peter at tesora.com]
Sent: Tuesday, June 28, 2016 3:39 PM
To: OpenStack Development Mailing List (not for usage questions); Ali Adil
Subject: Re: [openstack-dev] Change in openstack/trove[master]: Ophaned Volume Not Removed on Instance Delete
Hi Will,

Trove is a managed database service.  Once you delete the database, all associated volumes with it are also deleted, as is the Nova instance.  One of the key benefits of using Trove is that you don’t have to manage servers/volumes/security_groups etc.  Also, depending on the provider’s implementation, the volume may not be visible to the end user and thus would just be left lying around using up resources if it isn’t deleted by Trove (while potentially having the use charged back to the end user).  This is the case that is being addressed – having a volume left undeleted even if the Nova instance is gone (or in this case didn’t start successfully).

Thanks,
Peter


From: Will Zhou [mailto:zzxwill at gmail.com]
Sent: June-28-16 10:55 AM
To: OpenStack Development Mailing List (not for usage questions); Ali Adil
Subject: Re: [openstack-dev] Change in openstack/trove[master]: Ophaned Volume Not Removed on Instance Delete

Hi Scott, many thanks for your figuration.  Thanks and +1 for your nomination to nova core:)

Hi aadil, we should DETACH the volume, instead of DELETE. Please help enhance your code which is really a helpful fix to the bug. Thanks.

On Tue, Jun 28, 2016 at 10:51 PM D'Angelo, Scott <scott.dangelo at hpe.com<mailto:scott.dangelo at hpe.com>> wrote:
If a volume is attached to an instance, and the instance is deleted, the volume will be DETACHED, but the volume will still exist, it will NOT be DELETED.

It is up to the volume owner to delete the volume if they wish.

________________________________
From: Will Zhou <zzxwill at gmail.com<mailto:zzxwill at gmail.com>>
Sent: Tuesday, June 28, 2016 8:43:51 AM
To: aadil at tesora.com<mailto:aadil at tesora.com>; OpenStack Development Mailing List (not for usage questions)
Subject: Re: [openstack-dev] Change in openstack/trove[master]: Ophaned Volume Not Removed on Instance Delete

Hi all,

I'd like to make sure should the volume, which is attached to an instance, be detached or be deleted after the instance is deleted? Thanks.


On Tue, Jun 28, 2016 at 10:16 PM Ali Asgar Adil (Code Review) <review at openstack.org<mailto:review at openstack.org><mailto:review at openstack.org<mailto:review at openstack.org>>> wrote:
Ali Asgar Adil has posted comments on this change.

Change subject: Ophaned Volume Not Removed on Instance Delete
......................................................................


Patch Set 1:

In what situation would a nova instance be in "available" state. Also, we are are deleting the instance so we would want the volume to be deleted as well not detached.

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Gerrit-MessageType: comment
Gerrit-Change-Id: Ie921a8ff2851e2d9d76a3c3836945c750f090c4e
Gerrit-PatchSet: 1
Gerrit-Project: openstack/trove
Gerrit-Branch: master
Gerrit-Owner: Ali Asgar Adil <aadil at tesora.com<mailto:aadil at tesora.com><mailto:aadil at tesora.com<mailto:aadil at tesora.com>>>
Gerrit-Reviewer: Ali Asgar Adil <aadil at tesora.com<mailto:aadil at tesora.com><mailto:aadil at tesora.com<mailto:aadil at tesora.com>>>
Gerrit-Reviewer: Jenkins
Gerrit-Reviewer: zzxwill <zzxwill at gmail.com<mailto:zzxwill at gmail.com><mailto:zzxwill at gmail.com<mailto:zzxwill at gmail.com>>>
Gerrit-HasComments: No
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