From the GPFS V3.5 Advanced Administration guide, I see in Chapter 9 ("Identity Management on Windows")
Auto-generated ID mappings are the default. If no explicit mappings are created by the system
administrator in the Active Directory using Microsoft Identity Management for UNIX (IMU), all
mappings between security identifiers (SIDs) and UNIX IDs will be created automatically using a
reserved range in UNIX ID space.
The default reserved ID range used by GPFS starts with ID 15,000,000 and covers 15,000,000 IDs.
My question: is there documentation available on HOW a certain SID maps to an UID?
Is there an algorithm behind it (like Winbind's idmap_rid) - or is the first unknown SID assigned to first unallocated UID in that range?
Can Winbind / Samba SID-UID mapping be configured to behave in the same way as the GPFS auto-generated mappings ?
How can I see all user mappings that have been generated by GPFS so far? (SID<->UID)
Can I manually override / add SID<->UID mappings (eg wbinfo --set-uid-mapping)