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

[Wengang Wang <wen.gang.wang@oracle.com>]

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



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

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


----- On Feb 23, 2021, at 11:24 PM, Wengang Wang wen.gang.wang@oracle.com<mailto: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


Bernd
Helmholtz Zentrum München

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