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Type: Bug
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Resolution: Done
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Priority: Major - P3
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None
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Affects Version/s: 3.2.9
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Component/s: Performance
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None
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ALL
As of a few days ago, one node is my cluster is suddenly generating many slow queries. The machine is showing very high iowait (sustained > 30%) but cpu of mongod never > 1%. The machine is showing 26GB free memory and 0 swap used. This is the only node sharing with a mysqld process, but I don't understand why mongod is not taking lots of memory like on all other nodes.