Michael McCandless created LUCENE-5951:
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             Summary: Detect when index is on SSD and set dynamic defaults
                 Key: LUCENE-5951
                 URL: https://issues.apache.org/jira/browse/LUCENE-5951
             Project: Lucene - Core
          Issue Type: Improvement
            Reporter: Michael McCandless


E.g. ConcurrentMergeScheduler should default maxMergeThreads to 3 if it's on 
SSD and 1 if it's on spinning disks.

I think the new NIO2 APIs can let us figure out which device we are mounted on, 
and from there maybe we can do os-specific stuff e.g. look at  
/sys/block/dev/queue/rotational to see if it's spinning storage or not ...



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