Thanks for your response!
Do you have more detailed information if SCST is not fully implemented
using Xen and live-migration or is it a possible bug we could work on
and maybe fix it? Or is it not designed to work that way? That would
be interesting...
Zitat von "Griffith, John" <john.griff...@netapp.com>:
It’s not a config option. It’s the way the SCST target driver works
unfortunately. You’re using SCST and Xen, unfortunately neither of
which are configurations that I have any real experience with
especially when it comes to live-migration.
On Mar 1, 2016, at 03:35, Eugen Block <ebl...@nde.ag> wrote:
Follow up:
I ran another test with the external cinder-volume as storage
backend for my instances' images. Since cinder tried to create a
new target, this section was commented out in the scst.py to see
how far I can get. This leads to a new error, but not on the cinder
node. It's something that's not implemented yet for xen, IIUC.
So basically, I need to tell cinder somehow to not create a new
target but use the existing for that specific instance. But where
do I need to do that, which option is it in what config file?
Any help is appreciated!
Regards,
Eugen
Zitat von Eugen Block <ebl...@nde.ag>:
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
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NDE Netzdesign und -entwicklung AG fax : +49-40-559 51 77
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D-22423 Hamburg e-mail : ebl...@nde.ag
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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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--
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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