Before You Start Using MapR NFS

Make sure the following conditions are met before using the MapR NFS gateway:

  • The stock Linux NFS service must not be running. Linux NFS and MapR NFS cannot run concurrently.
  • The lock manager (nlockmgr) must be disabled.
  • On Red Hat and CentOS v6.0 and higher, the rpcbind service must be running.

    You can use the command ps ax | grep rpcbind to check.

  • On Red Hat and CentOS v5.x and lower, and on Ubuntu and SUSE, the portmapper service must be running.

    You can use the command ps ax | grep portmap to check.

  • The mapr-nfs package for NFSv3 must be present and installed.

    You can list the contents in the /opt/mapr/roles directory to check for nfs in the list.

  • Make sure you have applied a Community Edition (M3) license or an Enterprise Edition (M5) license (paid or trial) to the cluster.

    See Adding a License.

  • Make sure the MapR NFS service is started.

    See Starting, Stopping, and Restarting MapR NFS.

  • Verify that the primary group of the user listed for mapr.daemon.user in the /opt/mapr/conf/daemon.conf file is mapr.daemon.group.

    Restart Warden after any changes to daemon.conf.

For information about mounting the cluster using:

For information on upgrading your cluster, see Upgrading MapR Core.

Warning: To preserve compatibility with 32-bit applications and system calls, MapR-NFS uses 32-bit inode numbers by default. On 64-bit clients, this default forces the client's 64-bit inode numbers to be hashed down to 32 bits. Hashing 64-bit inodes down to 32 bits can potentially cause inum conflicts. To change the default behavior to 64-bit inode numbers, set the value of the Use32BitFileId property to 0 in the nfsserver.conf file, then restart the NFS server.