Remote mount at fileset level

This topic lists the steps to configure HDFS Transparency to mount a remote fileset.

To configure HDFS Transparency to mount a remote fileset, perform the following:

From the owning cluster, add the remote fileset into the allowed fileset list. For more information, see Fileset access control for remote clusters.

[root@owningcluster ~]# mmauth grant accessingcluster -f gpfs --fileset fset1,root
mmauth: [I] Collecting fileset information ...
mmauth: Granting cluster accessingcluster access to file system gpfs:
        access type rw; root credentials will not be remapped.
mmauth: Propagating the cluster configuration data to all affected nodes.
mmauth: Command successfully completed

Note: For the command to run successfully, ensure that the root fileset is included in the allow list when you are enabling the remote fileset access control.

Ensure that only the granted filesets are visible from the accessing cluster.

[root@accessingcluster ~]# mmlsfileset remotefs
Filesets in file system 'remotefs':
Name                     Status    Path
root                       Linked    /remotefs
indepfset1            Linked    /remotefs/indepfset1
depfset1               Linked    /remotefs/depfset1

Stop the HDFS Transparency cluster.
```
mmhdfs hdfs stop
```

For remote mount, set the granted fileset as the gpfs.data.dir parameter in gpfs-site.xml. Both independent and dependent filesets are supported. If you are operating with 2fs mode, no configuration changes are needed.

  <property>
    <name>gpfs.mnt.dir</name>
    <value>/remotefs</value>
    <description>gpfs mount point</description>
  </property>

<property>
    <name>gpfs.data.dir</name>
    <value>indepfset1</value>
    <description>Set this to a sub directory in gpfs mount point will make this sub directory as the root directory from hadoop client point of view. Leave it empty to make whole gpfs file system visible to hadoop client. When specify the sub directory, gpfs mount point should not be included in the string.</description>
</Property>

Upload and sync the changes across all the transparency nodes.
```
mmhdfs config upload 
```
Start all the transparency nodes and check the status of namenode.
```
mmhdfs hdfs start; hdfs haadmin -getAllServiceState
```
Change the fileset permissions from 700 to 755.
```
hdfs dfs -chmod 755 /
```