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This is a mongoDB replica set with 1 primary, 1 secondary and 1 arbiter. Suddenly the reads from disk into cache and cache page evictions increased 2x-3x and stay elevated since then (all metrics … below from primary unless noted otherwise): Indices, queries, average document size are unchanged. As far as I understand the theory: Wired Tiger uses 1.5GB of 4GB RAM for internal cache Eviction …
asked Oct 12 by Manuel