[Ocfs2-users] Problem w/ OCFS2 on RHEL5

[John Twyman]

Hi folks,

I've just started looking into ocfs2 as a means of allowing shared 
storage on our iSCSI raid box for two of our servers. My intention is to 
use linux-ha to provide highly available services (eg. samba) with ocfs2 
guaranteeing safe shared access to disk space. It seems straightforward 
but I've run into a problem on one of the two servers.

Both servers are running RHEL 5 with the 2.6.18-53.1.4.el5 kernel. 
They're identical in terms of hardware and iSCSI is working properly on 
both. I've downloaded and installed the three ocfs2 RPMS (ocfs2, 
ocfs2-tools and ocfs2console) successfully.

Following the instructions in the User's Guide I then type the following:

[root at host1 OCFS2]# /etc/init.d/o2cb status
Module "configfs": Not loaded
Filesystem "configfs": Not mounted
Module "ocfs2_nodemanager": Not loaded
Module "ocfs2_dlm": Not loaded
Module "ocfs2_dlmfs": Not loaded
Filesystem "ocfs2_dlmfs": Not mounted

[root at host1 OCFS2]# /etc/init.d/o2cb load
Loading module "configfs": OK
Mounting configfs filesystem at /sys/kernel/config: OK
Loading module "ocfs2_nodemanager": OK
Loading module "ocfs2_dlm": OK
Loading module "ocfs2_dlmfs": OK
Mounting ocfs2_dlmfs filesystem at /dlm: OK

All looking good but I run into problems on host2:

[root at host2 OCFS2]# /etc/init.d/o2cb status
Module "configfs": Not loaded
Filesystem "configfs": Not mounted
Module "ocfs2_nodemanager": Not loaded
Module "ocfs2_dlm": Not loaded
Module "ocfs2_dlmfs": Not loaded
Filesystem "ocfs2_dlmfs": Not mounted
[root at host2 OCFS2]# /etc/init.d/o2cb load
Loading module "configfs": OK
Mounting configfs filesystem at /sys/kernel/config: OK
Loading module "ocfs2_nodemanager": OK
Loading module "ocfs2_dlm": OK
Loading module "ocfs2_dlmfs": OK
Mounting ocfs2_dlmfs filesystem at /dlm: mount: block device ocfs2_dlmfs 
is write-protected, mounting read-only
mount: cannot mount block device ocfs2_dlmfs read-only
Unable to mount ocfs2_dlmfs filesystem
Failed

This, I'm afraid, leaves me stumped. I'm not sure how best to proceed.

I've updated the RHEL5 kernel to 2.6.18-53.1.6.el5 and built rpms from 
source for ocfs2 but to no avail. I get exactly the same problem on the 
same host.

Does anyone have any ideas as to how I might proceed? Any help would be 
greatly appreciated.

Cheers,
John

-- 

John Twyman
School of Geosciences
p: +61 2 9351 3189
m: +61 401 992 836
f: +61 2 9351 0184
c: http://www.geosci.usyd.edu.au/users/john/calendar/