[ovirt-users] oVirt 4.0.1 on FC23: problem mounting NFSv4 with fsid=0

[Nir Soffer]

On Wed, Jul 27, 2016 at 4:57 PM, Idan Shaby <ishaby at redhat.com> wrote:
> Hi,
>
> Can you please attach the vdsm log so we can get all the details?
>
>
> Thanks,
> Idan
>
> On Wed, Jul 27, 2016 at 4:24 PM, wodel youchi <wodel.youchi at gmail.com>
> wrote:
>>
>> Hi,
>>
>> I wanted to test the new version of oVirt the 4.0.1 on FC23, using HE
>> method and using NFSv4 for storage.
>>
>> When launching the deploy command, and choosing nfsv4 and filling the
>> mount point, the setup exits with error : Connection to storage server
>> failed.
>>
>> In vdsm log I have this error:
>> Could not connect to storageServer
>> Traceback (most recent call last):
>> ...
>> OSError: [Errno 2] Mount of `noveria.wodel.wd:/engine_vm` at
>> `/rhev/data-center/mnt/noveria.wodel.wd:_engine__vm` does not exist
>>
>> the df -h command shows that the nfs mount was done, but the device path
>> contains a double slash.
>> noveria.wodel.wd://vmengine  656G  111G  513G  18%
>> /rhev/data-center/mnt/noveria.wodel.wd:_vmengine

Can you share the output of:

    cat /proc/mounts

This is what vdsm is using the check if a mount exists.

>>
>>
>> I am not sure of the problem, but I think it's the double slash on the
>> nfs4 path when using fsid=0: noveria.wodel.wd://vmengine

Vdsm is normalizing the mount path - when you try to mount:

     noveria.wodel.wd://vmengine

Vdsm normalize the path to:

     noveria.wodel.wd:/vmengine

And it pass this value to the mount command.

Vdsm expect that the kernel will not modify the value and return unormalized
paths.

This looks like an issue reported in the util-linux list:
http://www.spinics.net/lists/util-linux-ng/msg13078.html

According to the report, this is known issue in the kernel and unlikely to
be fixed soon.

So it seems that we do need to normalize also what the kernel returns
in /proc/mounts.

Nir

>>
>> if I use nfsv4 with fsid=0, the problem shows up.
>> If I don't use fsid=0 and mention the full path of the nfs mount, the
>> problem disappears.
>>
>> Regards.
>>
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>
>
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