Gluster users - Aug 2013 - Centos5.9 Fuse Client fails to write file with 'dd'

Hello, Fellow Gluster Users

 I am testing writing file with 'dd' from FUSE client on Centos6 and
Centos5. Command syntax is i have used is:

/bin/dd if=/dev/zero of=/data/gluster/file bs=20M count=1 oflag=direct

   When I run it on Centos6 Client, I am receiving results as expected:

 1+0 records in
 1+0 records out
 20971520 bytes (21 MB) copied, 0.125189 s, 168 MB/s

  However, when I run the same command on CentOS5.9 I cant create a file.

/bin/dd: opening `/data/gluster/file': Invalid argument

  I can perform other operations such as copy or move onto FUSE mounted
director without any issues.

    Anyone else have seen similar behavior? My specs are below:

Client1: CentoOS 5.9(Final)2.6.18-348.16.1.el5.x84_64
glusterfs-3.4.0-8.el5
glusterfs-libs-3.4.0-8.el5
glusterfs-fuse-3.4.0-8.el5

Client2: CentOS 6.4(Final)2.6.32-358.el6.x86_64
glusterfs-fuse-3.4.0-8.el6.x86_64
glusterfs-3.4.0-8.el6.x86_64
glusterfs-libs-3.4.0-8.el6.x86_64

Gluster Server: CentOS 6.4(Final) 2.6.32-358.14.1.el6.x86_64
glusterfs-server-3.4.0-8.el6.x86_64
Type: Distributed-Replicate
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On 08/30/2013 10:10 PM, The Figuras wrote:
> Hello, Fellow Gluster Users
>
>   I am testing writing file with 'dd' from FUSE client on Centos6
and
> Centos5. Command syntax is i have used is:
>
> /bin/dd if=/dev/zero of=/data/gluster/file bs=20M count=1 oflag=direct
>     When I run it on Centos6 Client, I am receiving results as expected:
>
>   1+0 records in
>   1+0 records out
>   20971520 bytes (21 MB) copied, 0.125189 s, 168 MB/s
>
>    However, when I run the same command on CentOS5.9 I cant create a file.
>
> /bin/dd: opening `/data/gluster/file': Invalid argument
FUSE kernel module in CentOS 5 does lack support for O_DIRECT. By 
dropping the oflag=direct argument with CentOS 5, the write should go 
through.

-Vijay