Performance - pool with erasure/replicated type pool

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Hello,
I have 2 pools as below:

1. pool1 with erasure type
2. pool2 with replicated type

I ran the "rados bench" with above 2 pool and the results came as below:

- Read performance - around 60% better for replicated type pool ie pool2
- Write performance - around 50 % better for erasure type pool ie pool1.

Can someone help me, if the above is correct behavior with ceph?
Or do I miss something here?

Thanks
Swami
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