[Gluster-users] Inconsistent md5sum of replicated file

Anthony Delviscio adelviscio at gmail.com
Wed Sep 7 07:48:25 PDT 2011


Pranith, by parent directory, do you mean the directory that contains the
file or the top level directory of the brick?



My gluster volume info:

http://pastie.org/2493045

The hostnames used in the gluster volume info are DNS hostnames that resolve
to 10GB interfaces on the Gluster nodes.

The hostname used in the mount options is a RR DNS hostname that resolves to
all eight Gluster nodes.



Stat/md5sum/getfattr data of the identical files with different md5sums.

http://pastie.org/2497461



Thank you


On Wed, Sep 7, 2011 at 4:43 AM, Pranith Kumar K <pranithk at gluster.com>wrote:

> **
> hi Anthony,
>       Could you send the output of the getfattr -d -m . -e hex <filepath>
> on both the bricks and also the stat output on the both the backends. Give
> the outputs for its parent directory also.
>
> Pranith.
>
>
> On 09/07/2011 04:22 AM, Anthony Delviscio wrote:
>
>  I was wondering if anyone would be able to shed some light on how a file
> could end up with inconsistent md5sums on Gluster backend storage.
>
>
>
> Our configuration is running on Gluster v3.1.5 in a distribute-replicate
> setup consisting of 8 bricks.
>
> Our OS is Red Hat 5.6 x86_64.  Backend storage is an ext3 RAID 5.
>
>
>
> The 8 bricks are in RR DNS and are mounted for reading/writing via NFS
> automounts.
>
>
>
> When comparing md5sums of the file from two different NFS clients, they
> were different.
>
>
>
> The extended attributes of the files on backend storage are identical.  The
> file size and permissions are identical.  The stat data (excluding inode
> on backend storage file system) is identical.
>
> However, running md5sum on the two files, results in two different md5sums.
>
>
>
> Copying both files to another location/server and running the md5sum also
> results in no change – they’re still different.
>
>
>
> Gluster logs do not show anything related to the filename in question.  Triggering
> a self-healing operation didn’t seem to do anything and it may have to do
> with the fact that the extended attributes are identical.
>
>
>
> If more information is required, let me know and I will try to accommodate.
>
>
> Thank you
>
>
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>
>
>
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