Re: [Ocfs2-devel] error message in log: ocfs2_reflink_ioctl:4431 ERROR: status = -17

["Lentes, Bernd" <bernd.lentes@helmholtz-muenchen.de>]

-- 

Bernd Lentes 
System Administrator 
Institute for Metabolism and Cell Death (MCD) 
Building 25 - office 122 
HelmholtzZentrum München 
bernd.lentes@helmholtz-muenchen.de 
phone: +49 89 3187 1241 
phone: +49 89 3187 3827 
fax: +49 89 3187 2294 
http://www.helmholtz-muenchen.de/mcd

----- On Feb 25, 2021, at 5:43 PM, Wengang Wang wen.gang.wang@oracle.com wrote:

>> On Feb 25, 2021, at 4:39 AM, Lentes, Bernd < [
>> mailto:bernd.lentes@helmholtz-muenchen.de | bernd.lentes@helmholtz-muenchen.de
>> ] > wrote:

>> ----- On Feb 24, 2021, at 10:49 PM, Wengang Wang [
>> mailto:wen.gang.wang@oracle.com | wen.gang.wang@oracle.com ] wrote:

>>>> On Feb 24, 2021, at 1:11 AM, Lentes, Bernd < [
>>>> mailto:bernd.lentes@helmholtz-muenchen.de | bernd.lentes@helmholtz-muenchen.de
>>>> ] >
>>>> wrote:

>>>> ----- On Feb 23, 2021, at 11:24 PM, Wengang Wang [
>>>> mailto:wen.gang.wang@oracle.com |
>>>> wen.gang.wang@oracle.com ] wrote:

>>>>> #define EEXIST 17 /* File exists */

>>>>> You may already have the file created from the other node.

>>>>> wengang

>>>> Hi Wengang,

>>>> thanks for your help.

>>>> The reflink is created via:
>>>> reflink -fv /path/to/domain.raw /mnt/ocfs2/reflink

>>>> Of course this file exists already because the skript ran also one day before.
>>>> But from which node the previous one was created is unpredictable, it might be
>>>> the same
>>>> but also the other one.

>>>> Is the message severe or don't i have to bother about it ?

>>> OCFS2 is a shared-storage cluster FS. For the reflinks, you need and should
>>> create them only from one of the nodes. Don’t do duplicated work (reflink) on
>>> other nodes.

>> Hi Wengang,

>> thanks for your help.
>> Just to be sure that i understand you completely:
>> we reflink some raw file from host 1 and OTHER raw files (not the same !) from
>> host 2.
>> Is that already a problem ? Or are you talking about reflinking the SAME file
>> concurrently from both nodes ?

> No, that’s not a problem. Make sure your applications does the same as you want.
> From the error message, your app could be creating duplicated reflinks from one
> or two nodes.
> That’s what we can know by the error message. I am suspecting the problem is in
> your app, you could try to debug it.

> thanks,
> wengang

Hi,

what we do is to overwrite the reflink from the day before with the current one, with the same name.
For this we use reflink -f. Could that be the culprit ?
Should we delete the old one before ? Or maybe use unique names for each reflink ?

Thanks.

Bernd
Helmholtz Zentrum München

Helmholtz Zentrum Muenchen
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