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10.2. Additional Configuration Considerations
In addition to the locking considerations, you should take the following into account when configuring an NFS service over a GFS or GFS2 file system.
- Red Hat supports only Red Hat Cluster Suite configurations using NFSv3 with locking in an active/passive configuration with the following characteristics:
- The backend file system is a GFS or GFS2 file system running on a 2 to 16 node cluster.
- An NFSv3 server is defined as a service exporting the entire GFS/GFS2 file system from a single cluster node at a time.
- The NFS server can fail over from one cluster node to another (active/passive configuration).
- No access to the GFS/GFS2 file system is allowed except through the NFS server. This includes both local GFS/GFS2 file system access as well as access through Samba or Clustered Samba.
- The GFS or GFS2 file system must be mounted with the
localflocksoption. - There is no NFS quota support on the system.
This configuration provides HA for the file system and reduces system downtime since a failed node does not result in the requirement to execute thefsckcommand when failing the NFS server from one node to another. - The
fsid=NFS option is mandatory for NFS exports of GFS/GFS2. - There is currently an issue with failover and failback when using NFSv3 over GFS with TCP when the following scenario comes into play:
- Client A mounts from server 1.
- The system administrator moves NFS service from server 1 to server 2.
- The client resumes I/O operations.
- The system administrator moves NFS service from server 2 to server 1.
In this situation, the NFS service on server 1 does not get shut down because this would render other NFS services inoperable.Should this situation arise, you should move all NFS services off of server 1 and run theservice nfs restart. After this you can safely migrate your NFS services back to server 1. - If problems arise with your cluster (for example, the cluster becomes inquorate and fencing is not successful), the clustered logical volumes and the GFS/GFS2 file system will be frozen and no access is possible until the cluster is quorate. You should consider this possibility when determining whether a simple failover solution such as the one defined in this procedure is the most appropriate for your system.
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