Bug 1292173 - Error when preparing images created on a gluster storage domain based on a gluster volume with underscores
Error when preparing images created on a gluster storage domain based on a gl...
Product: vdsm
Classification: oVirt
Component: Core (Show other bugs)
Unspecified Unspecified
unspecified Severity high (vote)
: ovirt-3.6.5
: ---
Assigned To: Ala Hino
Aharon Canan
Depends On:
  Show dependency treegraph
Reported: 2015-12-16 11:04 EST by Sahina Bose
Modified: 2016-01-25 07:48 EST (History)
4 users (show)

See Also:
Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of:
Last Closed: 2016-01-25 07:48:48 EST
Type: Bug
Regression: ---
Mount Type: ---
Documentation: ---
Verified Versions:
Category: ---
oVirt Team: Storage
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---
sabose: ovirt‑3.6.z?
sabose: planning_ack?
sabose: devel_ack?
sabose: testing_ack?

Attachments (Terms of Use)
vdsm log showing the error (60.47 KB, text/plain)
2015-12-17 03:14 EST, Joop van de Wege
no flags Details

  None (edit)
Description Sahina Bose 2015-12-16 11:04:42 EST
Description of problem:
Summarizing problem reported in ML by Joop:

It looks like that something goes wrong in
vdsm/storage/glusterVolume.py. Volname in  getVmVolumeInfo ends up with
a volumename with double underscores in it, then
svdsmProxy.glusterVolumeInfo is called which in the end calls a cli
script, by supervdsmd, which returns an empty xml document because there
is no such volume with double underscores. Running the command which is
logged in supervdsm.log confirms this too. Reducing the volname to have
only single underscores returns a correct xml object.
In my case:
Real path entered during setup: st01:gv_ovirt_data01
What's used: st01:gv__ovirt__data01

Version-Release number of selected component (if applicable):

How reproducible:

Additional info:
Comment 1 Joop van de Wege 2015-12-17 03:14 EST
Created attachment 1106600 [details]
vdsm log showing the error
Comment 2 Joop van de Wege 2015-12-17 03:16:56 EST
Version of vdsm used:

Text of the original post to users at ovirt.org @ 14-12-2015 12:00

I have reinstalled my test environment have come across an old error,
see BZ 988299, Bad volume specification {u'index': 0,.

At the end of that BZ there is mentioning of a problem with '_' in the
name of the volume and a patch is mentioned but the code has since been
change quite a bit and I can't find if that still applies. It look like
it doesn't because I have a gluster volume with the name gv_ovirt_data01
and it look like it gets translated to gv__ovirt__data01 and then I
can't start any VMs 
Weird thing, I CAN import VMs from the export domain to this gluster domain.

Followup mail:
I have just done the following on 2 servers which also hold the volumes
with '_' in it:

mkdir -p /gluster/br-ovirt-data02

ssm -f create -p vg_`hostname -s` --size 10G --name lv-ovirt-data02 --fstype xfs /gluster/br-ovirt-data02

echo /dev/mapper/vg_`hostname -s`-lv-ovirt-data02         /gluster/br-ovirt-data02        xfs     defaults        1 2 >>/etc/fstab

semanage fcontext -a -t glusterd_brick_t /gluster/br-ovirt-data02

restorecon -Rv /gluster/br-ovirt-data02

mkdir /gluster/br-ovirt-data02/gl-ovirt-data02

chown -R 36:36 /gluster/

Added a replicated volume on top of the above, started it, added a
Storage Domain using that volume, moved a disk to it, and started the
VM, works!
Comment 3 Joop van de Wege 2015-12-17 04:23:39 EST
In vdsm-4.16.X it isn't a problem because I have one hosted-engine setup with that version and a underscore in the volume name.
The command to check for gluster volumes is different though:
/usr/sbin/gluster --mode=script volume info --xml
and in vdsm-4.17.X its:
/usr/sbin/gluster --mode=script volume info --remote-host=st01.nieuwland.nl gv__ovirt__data01 --xml
Comment 4 Ala Hino 2016-01-06 06:58:07 EST
Hi Joop,

The code that fails seems to be related to a patch (https://gerrit.ovirt.org/44061) that isn't merged to any branch. Actually, this patch wasn't tested nor verified.

Basically, there should be no issues with volume names that include underscores in their names.

Is vdsm-4.17.X build that you tried a private build?
Can you try same scenarios using a stable branch?

Comment 5 Joop van de Wege 2016-01-25 07:45:04 EST
It looks like a private build was indeed used. Can't replicate it at the moment so this can be closed


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