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Troubleshooting - Red Hat ENTERPRISE LINUX 5 - CONFIGURATION NFS OVER GFS Configuration Manual

Nfs over gfs in a 5-node red hat cluster using conga
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Chapter 7.

Troubleshooting

If you find that you are seeing error messages when you try to configure your system, or if after
configuration your system does not behave as expected, you can perform the following checks and
examine the following areas.
• Connect to one of the nodes in the cluster and execute the clustat(8) command. This command
runs a utility that displays the status of the cluster. It shows membership information, quorum view,
and the state of all configured user services.
The following example shows the output of the clustat(8) command.
[root@clusternode4 ~]# clustat
Cluster Status for nfsclust @ Wed Dec
Member Status: Quorate
Member Name
------ ----
clusternode5.example.com
clusternode4.example.com
clusternode3.example.com
clusternode2.example.com
clusternode1.example.com
Service Name
------- ---
service:nfssvc
In this example, clusternode4 is the local node since it is the host from which the command was
run. If rgmanager did not appear in the Status category, it could indicate that cluster services are
not running on the node.
• Connect to one of the nodes in the cluster and execute the group_tool(8) command. This
command provides information that you may find helpful in debugging your system. The following
example shows the output of the group_tool(8) command.
[root@clusternode1 ~]# group_tool
type
fence
[1 2 3 4 5]
dlm
[1 2 3 4 5]
dlm
[3 4 5]
dlm
[5]
gfs
[5]
Owner (Last)
----- ------
clusternode2.example.com
level name
0
default
1
clvmd
1
rgmanager
1
mygfs
2
mygfs
3 12:37:22 2008
ID
Status
---- ------
1 Online, rgmanager
2 Online, Local, rgmanager
3 Online, rgmanager
4 Online, rgmanager
5 Online, rgmanager
id
state
00010005 none
00020005 none
00030005 none
007f0005 none
007e0005 none
State
-----
starting
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