[openstack-dev] [nova] [cinder] Issue with live migration of instances with encrypted volumes

Carlton, Paul (Cloud Services) paul.carlton2 at hpe.com
Tue Nov 1 12:02:55 UTC 2016


Yes, thanks, but the thing is this does not occur with regular volumes!

The process seems to be you need to connect the volume then the encryptor.

In pre migration at the destination I connect the volume and then setup the encryptor and that works fine, but in post migration

at destination it rebuilds the instance xml and defines the vm which calls _get_guest_storage_config which does another call to

connect_volume.  This seems redundant to me, because it is already connected,

but it works for normal volumes and if I bypass it for encrypted volumes

it just fails with the same error when the same function is

called as part of

a subsequent hard


Paul Carlton
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Cloud Services
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From: Daniel P. Berrange <berrange at redhat.com>
Sent: 01 November 2016 11:29:51
To: OpenStack Development Mailing List (not for usage questions)
Subject: Re: [openstack-dev] [nova] [cinder] Issue with live migration of instances with encrypted volumes

On Tue, Nov 01, 2016 at 11:22:25AM +0000, Carlton, Paul (Cloud Services) wrote:
> I'm working on a bug https://bugs.launchpad.net/nova/+bug/1633033 with the live migration of
> instances with encrypted volumes. I've submitted a work in progress version of a patch
> https://review.openstack.org/#/c/389608 but I can't overcome an issue with an iscsi command
> failure that only occurs for encrypted volumes during the post migration processing, see
> http://paste.openstack.org/show/587535/
> Does anyone have any thoughts on how to proceed with this issue?

No particular ideas, but I wanted to point out that the scsi_id command
shown in that stack trace has a device path that points to the raw
iSCSI LUN, not to the dm-crypt overlay. So it looks like you're hitting
a failure before you get the encryption part, so encryption might be

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