[Ocfs2-test-devel] [Ocfs2-tools-devel] [PATCH 09/10] Trigger udev rescan to get volume label that mkfs made remotely.

[eric]

Hi Junxiao,

Thanks for your help.

On multiple nodes, say, start testing on node1, then testing on node2 would
break at some time. From the log, it complained testing file cannot be 
found. Finally,
I found it's because disk had not been mounted on node2. Some sub-tests 
mount
disk by "-L" instead of device name. But, label "XXX" cannot found on 
node2.

Here is my initial record for this:
https://github.com/renzhengeek/issues/issues/3

For more details:

https://bugzilla.suse.com/show_bug.cgi?id=925564

It's very odd. Do I make it clear?
I wouldn't believe this problem could be true ;-)

Thanks,
Eric



On 09/23/15 14:16, Junxiao Bi wrote:
> On 09/23/2015 10:07 AM, Eric Ren wrote:
>> Hello Junxiao and all,
>>
>> I'd like to confirm with you on this problem again. Because I "mkfs.ext4 -L
>> xxx /dev/sda" on one node, and cannot "mount -L xxx /mnt" on another
>> node, only got "-L xxx cannnot found" error message. It seems not a
>> ocfs2-specific problem. /dev/sda is an iscsi disk. So, I doubt if it's
>> an iscsi problem.
>>
> Maybe my mistake, i can't mount also when i try today with iscsi disk.
> But i never see a failure during my ocfs2-test. What is the issue the
> patch fixing?
>
> Thanks,
> Junxiao.
>> Here's this problem on bugzilla:
>> https://bugzilla.suse.com/show_bug.cgi?id=925564
>>
>> My QUESTIONs are:
>> 1. was /dev/sda an iscsi disk in your case?
>>
>> 2. Could you try ext4 in that way for this? Cause I want to see how
>> things would go beyond our SUSE environment.
>> I really appreciate your help ;-)
>>
>> Thanks,
>> Eric Ren
>>
>> On Fri, Sep 11, 2015 at 04:32:24AM -0600, Eric Ren wrote:
>>> Hi Junxiao,
>>>
>>> Thanks very much for your view!
>>>
>>> I reported this problem to ocfs2 devel list long time ago. You can see here:
>>> https://oss.oracle.com/pipermail/ocfs2-devel/2015-March/010691.html
>>>
>>> And I just now test this gain, and the another node cannot find the LABEL on cluster with good condition.
>>> If thing's OK on your side, It may be relative to distribution,or other factors.
>>>
>>> Anyway, I'll take more care about this. Thanks again ;-)
>>>
>>> --
>>> Eric Ren
>>>
>>>   >>>
>>>> Hi Eric,
>>>>   
>>>> On 09/10/2015 02:54 PM, zren at suse.com wrote:
>>>>> From: Eric Ren <zren at suse.com>
>>>>>   
>>>>> Volume label used to mount disk remotely is not visible on remote
>>>>> node. So before mounting, trigger udevadm rescan to get volume label.
>>>> Is this needed? mount can detect the new label.
>>>> I "mkfs.ocfs2 -L xxx /dev/sda" one one node, and can "mount -L xxx /mnt"
>>>> on another node.
>>>>   
>>>> Thanks,
>>>> Junxiao.
>>>>   
>>>>>   
>>>>> Signed-off-by: Eric Ren <zren at suse.com>
>>>>> Reviewed-by: Gang He <ghe at suse.com>
>>>>> ---
>>>>>   programs/python_common/remote_mount.py | 16 ++++++++++++++--
>>>>>   1 file changed, 14 insertions(+), 2 deletions(-)
>>>>>   
>>>>> diff --git a/programs/python_common/remote_mount.py
>>>> b/programs/python_common/remote_mount.py
>>>>> index 7520405..088ba46 100755
>>>>> --- a/programs/python_common/remote_mount.py
>>>>> +++ b/programs/python_common/remote_mount.py
>>>>> @@ -126,8 +126,20 @@ command = str('%s -l %s -m %s %s' % (buildcmd,
>>>>>   	mt_options))
>>>>>   #
>>>>>   o2tf.OpenMPIInit(DEBUGON, options.nodelist, logfile, 'ssh')
>>>>> -#
>>>>> -#
>>>>> +
>>>>> +# tigger udev rescan
>>>>> +ret = o2tf.openmpi_run(DEBUGON,
>>>>> +                nproc,
>>>>> +                'udevadm trigger',
>>>>> +                options.nodelist,
>>>>> +                remote_method,
>>>>> +                options.interface,
>>>>> +                logfile,
>>>>> +                'WAIT')
>>>>> +
>>>>> +#wait for completing udev rescan.10s is only tested on 3-nodes.
>>>>> +time.sleep(10)
>>>>> +
>>>>>   ret = o2tf.openmpi_run(DEBUGON,
>>>>>   		 nproc,
>>>>>   		 str('%s' % command),
>>>>>   
>>>>   
>>>>   
>>>>   
>>>
>>>
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>>>
>