Gluster users - Oct 2009 - mmap() shared read/write support - exists with FUSE 2.8.1 and GlusterFS 2.0.7 on kernel RHEL5 kernel 2.6.18-164?

I have been doing a lot of reading and re-learning about FUSE over the
last week as I have been setting up GlusterFS in our dev environment.
I cannot seem to get mmap() support to work.  This is my set up:

* RHEL5 / CentOS5
* FUSE 2.8.1
* GlusterFS 2.0.7
* RHEL5 kernel 2.6.18-164 (RHEL5.3, CentOS 5.3)
* fuse.ko built from kernel source

I continually get this when trying to use rrdtool to create or update
RRD files on a shared front end:

ERROR: mmaping file
'/data/nagios/pnp/db/nagios-report/Test_2_-_192.168.79.132.rrd': No
such device

I can create and replicate files through scripts or vi/vim just fine
on my two front end two back end cluster.

Any ideas of what I might be doing wrong or if this is just a
configuration / version mix that plain does not suppport mmap shared
write access?  Any pointers / tips / advice appreciated.

Thanks,
Max

Older versions of the fuse module (like that in the kernel you just
mentioned) do not support mmap. Anything with kernel 2.6.27 or newer fully
support it.

Justice London
jlondon at lawinfo.com

-----Original Message-----
From: gluster-users-bounces at gluster.org
[mailto:gluster-users-bounces at gluster.org] On Behalf Of Max
Sent: Wednesday, October 14, 2009 12:15 PM
To: gluster-users at gluster.org
Subject: [Gluster-users] mmap() shared read/write support - exists with
FUSE2.8.1 and GlusterFS 2.0.7 on kernel RHEL5 kernel 2.6.18-164?

I have been doing a lot of reading and re-learning about FUSE over the
last week as I have been setting up GlusterFS in our dev environment.
I cannot seem to get mmap() support to work.  This is my set up:

* RHEL5 / CentOS5
* FUSE 2.8.1
* GlusterFS 2.0.7
* RHEL5 kernel 2.6.18-164 (RHEL5.3, CentOS 5.3)
* fuse.ko built from kernel source

I continually get this when trying to use rrdtool to create or update
RRD files on a shared front end:

ERROR: mmaping file
'/data/nagios/pnp/db/nagios-report/Test_2_-_192.168.79.132.rrd': No
such device

I can create and replicate files through scripts or vi/vim just fine
on my two front end two back end cluster.

Any ideas of what I might be doing wrong or if this is just a
configuration / version mix that plain does not suppport mmap shared
write access?  Any pointers / tips / advice appreciated.

Thanks,
Max
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