By default, GPFS does not automatically start down disks. You could add a 
callback “downdisk” via mmaddcallback that could trigger a “mmchdisk start” if 
you wanted. If a disk is marked down, it’s better to determine why before 
trying to start it as it may involve other issues that need investigation.

Bob Oesterlin
Sr Principal Storage Engineer, Nuance

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Date: Wednesday, August 9, 2017 at 6:33 AM
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Subject: [EXTERNAL] [gpfsug-discuss] Is GPFS starting NSDs automatically?

Does GPFS start “down” disks in a filesystem automatically? For instance, when 
connection to NSD is recovered, but it the meantime disk was put in “down” 
state by GPFS. Will GPFS in such case start the disk?

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