Can 16 server grade ssd's be slower then 60 hdds? (no extra journals)

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I have a productive 60 osd's cluster. No extra Journals. Its performing okay. Now I added an extra ssd Pool with 16 Micron 5100 MAX. And the performance is little slower or equal to the 60 hdd pool. 4K random as also sequential reads. All on dedicated 2 times 10G Network. HDDS are still on filestore. SSD on bluestore. Ceph Luminous.
What should be possible 16 ssd's vs. 60 hhd's no extra journals?

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