Hi Ceph-Experts, Have a small ceph architecture related question
As blogs and documents suggest that ceph perform much better if we use journal on SSD. I have made the ceph cluster with 30 HDD + 6 SSD for 6 OSD nodes. 5 HDD + 1 SSD on each node and each SSD have 5 partition for journaling 5 OSDs on the node. Now I ran similar test as I ran for all HDD setup. What I saw below two reading goes in wrong direction as expected 1) 4K write IOPS are less for SSD setup, though not major difference but less. 2) 1024K Read IOPS are less for SSD setup than HDD setup. On the other hand 4K read and 1024K write both have much better numbers for SSD setup. Let me know if I am missing some obvious concept. Thanks sumit
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