(Doc?... I ain't about to read a manual! But just to cover our bases we did stick it into the 4.1.1 pubs)
Policy improvements: This release includes the following policy improvements: ... (summary of changes, page xv) ... Implicit SET POOL 'first-data-pool' rule For file systems that are at or have been upgraded to 4.1.1, the system recognizes that, even if no policy rules have been installed to a file system by mmchpolicy , data files should be stored in a non-system pool if available (rather than in the system pool, which is the default for earlier releases). For more information, see the following: Information Lifecycle Management chapter in the IBM Spectrum Scale: Advanced Administration Guide ... ( mmchpolicy man page 298) ... For file systems that are at or have been upgraded to 4.1.1 or later: If there are no SET POOL policy rules installed to a file system by mmchpolicy, the system acts as if the single rule SET POOL 'first-data-pool' is in effect, where first-data-pool is the firstmost non-system pool that is available for file data storage, if such a non-system pool is available. (“Firstmost” is the first according to an internal index of all pools.) However, if there are no policy rules installed and there is no non-system pool, the system acts as if SET POOL 'system' is in effect. This change applies only to file systems that were created at or upgraded to 4.1.1. Until a file system is upgraded, if no SET POOL rules are present (set by mmchpolicy) for the file system, all data will be stored in the 'system' pool. For information on GPFS policies, see the IBM Spectrum Scale: Advanced Administration Guide.
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