[Ocfs2-users] ocfs2_encode_fh:152 ERROR: fh buffer is too small for encoding

[Wang2, Colin (NSN - CN/Cheng Du)]

Hi Sunil,

Thanks a lot for your help.

Base on your questions,
1. The error is time issue. And it's a production system, it's hard to
install a debug version. 
I appreciate if you share some document about debug version so I can
test it while have chance.

2.  Confirmed with onsite engineer.
I think it's a file data corruption but file system. Here are scenes.
The system has 2 nodes with ocfs2 filesystem, and nfs export on one
node. 
Suppose:
Node name: db1, db2
Node that currently export NFS; db1
Node that mount exported nfs: app1
A. Read/write file corruption.
    Shutdown app1.
    When check file with ls command,  it's blinking on db1, it's ok on
db2. 
    Remove on db2 failed too.
    Can't unmount and stop ocfs2 on db2.
    Faillover nfs to db1 and reboot db2.
    It's ok to delete on db1.
    Reboot app1, it can use exported fs.
I don't what the error, why file is blinking? inode missed?

B. Readonly file corruption.
   Update file, maybe from db1, maybe from db2.
   app1 report corruption file.
   Failover nfs from db1 to db2.
   Reboot app1, it's ok now.
I think this scene caused by exported nfs fs not lock relative file, and
partial content of updated file on another node(like db2) is not
synchnized to db1 and then to app1, so app1 report corruption.

I think this scene can be prevented from update file from db1(currently
nfs exported node) but db2. 

BRs,
Colin

-----Original Message-----
From: ext Sunil Mushran <sunil.mushran at oracle.com>
To: Wang2, Colin (NSN - CN/Cheng Du) <colin.wang2 at nsn.com>
Cc: ocfs2-users at oss.oracle.com <ocfs2-users at oss.oracle.com>
Subject: Re: [Ocfs2-users] ocfs2_encode_fh:152 ERROR: fh buffer is too
small for encoding
Date: Wed, 11 Nov 2009 09:58:13 -0800


I doubt the two issues are related. I cannot see how unable to encode an 
nfs filehandle
can lead to a file corruption. Having said that, I am puzzled by that 
error. Is this is
one time thing or more often. If so, we could provide you with a debug 
version that will
dump more info.

As far as the corruption goes, I was to confirm that this is a file data 
corruption and not
a file system corruption? Do you know what the corruption is? Has anyone 
analyzed the data?

Sunil

Wang2, Colin (NSN - CN/Cheng Du) wrote:
> Hello,
>
> We have one Oracle 10G R2 RAC production system, we installed OCFS2 on 
> both system and export ocfs2 filesystem via. nfs,  this export is 
> protected under oracle clusterware.
>
> A few days ago, our system stop work and report corrupted file in nfs 
> filesystem.
> I found below error in /var/log/messages.
> -- Nov  7 10:03:24 dbu2pub kernel: (1751,3):ocfs2_encode_fh:152 ERROR: 
> fh buffer is too small for encoding
>
> Could you help me?
> - What's meaning of this error?
> - Does the error will corrupt file system under export ocfs2 via nfs?
>
> I searched web but they are all about NFSv2, but we used NFSv3. So I 
> ask for your help. Thanks in advance.
>
> Our environment,
>       Red Hat Enterprise Linux AS release 4 (Nahant Update 6)
>       2.6.9-67.ELsmp
>
>       ocfs2-2.6.9-67.ELsmp-1.2.8-2.el4
>       ocfs2-tools-1.2.7-1.el4
>       ocfs2console-1.2.7-1.el4
>
> BRs,
> Colin
> ------------------------------------------------------------------------
>
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> Ocfs2-users at oss.oracle.com
> http://oss.oracle.com/mailman/listinfo/ocfs2-users

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