[ovirt-users] [STORAGE] Adding posix compliant FS

[Julian De Marchi]

On 12/18/14 18:23, Gianluca Cecchi wrote:
> On Thu, Dec 18, 2014 at 7:12 AM, Vered Volansky <vered at redhat.com> wrote:
>>
>>
>>>
>>> Hey Vered,
>>>
>>>> IIUC the you have a self-created lvm, to which you're trying to
>> connect as
>>>> posix using ovirt.
>>>> If that's the case please try to manually change the device's
>> permissions
>>>> to 36:36 under /dev/<your_VG>.
>>>> If that doesn't work try the actual device it's mapped to (which is
>> what
>>>> vdsm actually tries to mount).
>>>> If that also doesn't work please send us the output of:
>>>>>> ls -lh /dev/<your_VG> .
>>>
>>> Still failed mate after a chmod 36:36. The thing is though, it _does_
>>> mount the device for a moment before failing and unmounting it...
>> Is this the same behaviour as before?
>>
>>>
>>> [root at blade01 ~]# ls /dev/VolGroup/lv_images -lh
>>> lrwxrwxrwx 1 root root 7 Dec 15 16:52 /dev/VolGroup/lv_images -> ../dm-2
>>
>> I see /dev/VolGroup/lv_images are still root:root.
>> Please chown 36:36 as well.
>>
>> Please state the all the chown you tried.
>>
>>
>>
>
> Possibly a starting point for automating LVM device permissions setting is
>
> https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/6/html/Logical_Volume_Manager_Administration/udev_device_manager.html
>
> and in particular the possibility to add, under /lib/udev/rules, a
> customized file based on the one found in
> /usr/share/doc/device-mapper/12-dm-permissions.rules
>
> Not tried myself though...

I don't think permissions for the device are the root cause of the 
issue. The way I see it behave when I try and mount it is:

   vdsm will mount the device(If I'm quick I can see this with a LS). It 
then tries to write some kind of test file(I'm guessing) and as the 
mount point is still owned by root when vdsm tries to do the touch to 
test it fails. Then vdsm backs out and I get the failed to add storage 
error.

--julian