Setting configuration parameters before installation

After you define nodes in the cluster definition file, you can set certain configuration parameters in the cluster definition. Use the ./spectrumscale config gpfs command for this purpose.

To specify a cluster name in the cluster definition, use the -c argument.
```
./spectrumscale config gpfs -c gpfscluster01.my.domain.name.com
```
In this example, gpfscluster01.my.domain.name.com is the cluster name.

If no cluster name is specified, the GPFS admin node name is used as the cluster name. If the user-provided name contains periods, it is assumed to be a fully qualified domain name. If the cluster name is not a fully qualified domain name, the cluster name domain name is inherited from the admin node domain name.
To specify a profile in the cluster definition file to be set on cluster creation, use the -p argument.
```
./spectrumscale config gpfs -p randomio
```
The valid values for -p option are default (for gpfsProtocolDefaults profile), randomio (for gpfsProtocolRandomIO profile), and ProfileName (for user-defined profile).
- The system-defined profiles are based on workload type: sequential I/O (gpfsProtocolDefaults) or random I/O (gpfsProtocolRandomIO). These defined profiles can be used to provide initial default tunables or settings for a cluster. If more tunable changes are required, see mmchconfig command and mmcrcluster command.
- You can specify a user-defined profile of attributes to be applied. The profile file specifies GPFS configuration parameters with values different than the documented defaults.
  A user-defined profile must have the following properties:
  - It must not begin with the string gpfs.
  - It must have the .profile suffix.
  - It must be located in the /var/mmfs/etc/ directory.
  For more information, see mmcrcluster command and mmchconfig command.
If no profile is specified in the cluster definition, the gpfsProtocolDefaults profile is automatically set on cluster creation.
To specify the remote shell binary to be used by GPFS, use the -r argument.
```
./spectrumscale config gpfs -r /usr/bin/ssh
```
If no remote shell is specified in the cluster definition, /usr/bin/ssh is used as the default.
To specify the remote file copy binary to be used by GPFS, use the -rc argument.
```
./spectrumscale config gpfs -rc /usr/bin/scp
```
If no remote file copy binary is specified in the cluster definition, /usr/bin/scp is used as the default.
To specify an ephemeral port range to be set on all GPFS nodes, use the -e argument.
```
./spectrumscale config gpfs -e 61000-62000
```
For information about the ephemeral port range, see IBM Storage Scale port usage.

If no port range is specified in the cluster definition, 60000-61000 is used as default.

To view the current GPFS configuration settings, issue the following command.

./spectrumscale config gpfs --list


[ INFO  ] No changes made. Current settings are as follows:
[ INFO  ] GPFS cluster name is gpfscluster01
[ INFO  ] GPFS profile is default
[ INFO  ] Remote shell command is /usr/bin/ssh
[ INFO  ] Remote file copy command is /usr/bin/scp
[ INFO  ] GPFS Daemon communication port range is 61000-62000