Multiple IBM Storage Scale file system support

Set up a CES HDFS cluster with storage type set to shared,shared. The storage setup must consist of two file system.

To add support for multiple IBM Storage® Scale file system, follow the steps listed below:

Set up the two file systems.
Set up CES HDFS cluster using the first mounted file system for HDFS and cesSharedRoot.
Verify the NameNode state and the health of CES HDFS nodes using the first mounted file system.

Add the second mounted file system using the following steps:

Stop all CES HDFS services in the CES HDFS cluster by running the following command:
```
mmhdfs hdfs stop
```

Edit the values of the gpfs.storage.type, gpfs.mnt.dir and gpfs.replica.enforced parameters in /var/mmfs/hadoop/etc/hadoop/gpfs-site.xml as follows:

  <property>
    <name>gpfs.mnt.dir</name>
    <value>/fs1,/fs2</value>
  </property>
  <property>
    <name>gpfs.storage.type</name>
    <value>shared,shared</value>
  </property>
  <property>
    <name>gpfs.replica.enforced</name>
    <value>gpfs,gpfs</value>
  </property>

Upload the config to update the CCR by running the following command:
```
mmhdfs config upload
```
Start the CES HDFS services and HDFS Transparency by running the following command:
```
mmhdfs hdfs start
```
Verify the state of the NameNode and DataNode by running the following commands:
```
mmhdfs hdfs-nn status
mmhdfs hdfs-dn status
```
Note: To list all the files/directories, run the following command:
```
hadoop dfs -ls /
```