6027-1807 [E] NSD nsdName is using Persistent Reserve, this will require an NSD server on an osName node.
Explanation
A client tried to open a globally-attached NSD disk,
but the disk is using Persistent Reserve. An osName NSD
server is needed. GPFS™ only
supports Persistent Reserve on certain operating systems.
User response
Use the mmchnsd command
to add an osName NSD server for the NSD.