Hi everyone,
I have successfully deployed a 3 node environment (1 control, 2
compute nodes, all of them running with openSUSE Leap 42.1) according
to the docs. I also added an external storage node as a cinder-volume
to store the instance images on a SAN-Server, not in local files. That
works just fine, until I try to (live-)migrate an instance.
The instances was created by
nova boot --block-device
source=image,id=24939ebe-6201-48f9-bb0d-5c207d94cea2,dest=volume,size=1,shutdown=remove,bootindex=0 --nic net-id=1940e2f7-ec41-4d2f-b531-11e8d229145d --flavor 1
VMfromVol
Running "nova live-migration VMfromVol" leads to this error in
cinder-volume.log:
---cut here---
Stdout: u'Unexpected error while running command.
Command: scstadmin -open_dev disk1 -handler vdisk_fileio -attributes
filename=/dev/ndesan03/volume-a3a78f9d-39b5-46af-aea8-d310a22795ff
Exit code: 1
Stdout: u"\\nCollecting current configuration: done.\\n\\n\\n-> Making
requested changes.\\n\\t-> Opening device \'disk1\' using handler
\'vdisk_fileio\': done.\\n\\n\\nFATAL: Received the following
error:\\n\\n\\tDevice already exists.\\n\\n"\nStderr: u\'\''
ERROR cinder.volume.manager ISCSITargetHelperCommandFailed: Failed to
add device to SCST handler
---cut here---
nova-compute.log only reports:
Remote error: ClientException The server has either erred or is
incapable of performing the requested operation.
and on the other compute node:
ClientException: The server has either erred or is incapable of
performing the requested operation.
So to summarize: there is an existing iscsi target on one compute node
for a running instance. The command "nova live-migration <server>
<host>" triggers cinder to create another iscsi target for the other
compute node, but with the same volume label, which already exists and
the operation fails. Is there something I'm missing in the config
files? How can I ensure that the other compute node only logs in to
the same target and doesn't create a new export?
I would really appreciate any help! If you need any other information
about my configs or the whole stack traces from nova-compute.log and
cinder-volume.log, please let me know!
Best regards,
Eugen
--
Eugen Block voice : +49-40-559 51 75
NDE Netzdesign und -entwicklung AG fax : +49-40-559 51 77
Postfach 61 03 15
D-22423 Hamburg e-mail : ebl...@nde.ag
Vorsitzende des Aufsichtsrates: Angelika Mozdzen
Sitz und Registergericht: Hamburg, HRB 90934
Vorstand: Jens-U. Mozdzen
USt-IdNr. DE 814 013 983
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