IBM Spectrum Scale configuration parameter checklist

The IBM Spectrum Scale checklist shows the parameters that affect the system, the Standard, and Advanced tabs in the Ambari wizard.

These are the important IBM Spectrum Scale parameters checklists:

Standard tab	Rule	Advanced tab	Rule
Cluster Name		Advanced core-site: fs.defaultFS	Ensure that hdfs://localhost:8020 is used
File system Name		Advanced gpfs-advance: gpfs.quorum.nodes	The node number must be odd. Note: In SAN storage deployment model with tiebreaker disk, quorum nodes can be even.
File system Mount Point
NSD stanza file	For more information, see Preparing for FPO environment.
Policy file	For more information, see Policy File.
Hadoop local cache disk stanza file	For more information, see Deploy HDP or IBM Spectrum Scale service on pre-existing IBM Spectrum Scale file system.
Default Metadata Replicas	<= Max Metadata Replicas
Default Data Replicas	<= Max Data Replicas
Max Metadata Replicas
Max Data Replicas

HDFS and IBM Spectrum Scale file system ACL support

HDFS and IBM Spectrum Scale HDFS Transparency support only POSIX ACL.

Ensure that you check the ACL value on the IBM Spectrum Scale file system and set it to all.

Otherwise, the Hadoop command will fail with Operation not supported: but POSIX command can be executed successfully.

To check the ACL value, run:

# /usr/lpp/mmfs/bin/mmlsfs <filesystem> -k


flag       value          description
-----   -----------   ----------------------------
-k         nfs4           ACL semantics in effect

To change the ACL value to all, run:

# /usr/lpp/mmfs/bin/mmchfs <filesystem> -k all

To check the ACL value after modification, run:

# /usr/lpp/mmfs/bin/mmlsfs <filesystem> -k


flag      value             description
-----   ----------     --------------------------
-k         all            ACL semantics in effect