Hello All, I need some recommendation on improving my cluster. I have a 4 node cluster with CEPH having 65 OSDs at 30 TB capacity. My cluster communication is currently at 1G NIC and I dont have any SSDs in my servers. I recently had issue with disk I/O time with some web-servers applications that use SQL/PHP intensively. I am looking into upgrading my cluster. What are the recommendations to improve my cluster performance. Should I add 10Gb ethernet cards or SSDs or both considering limited budget. Looking at my current CEPH stats they are not even at 1-2 MiB/s. I dont think I am saturating network links yet because the tests that I did yield a speed of 110 MiB/s. Would adding SSDs improve performance more or adding 10Gb NICs improve performance more ? Any help/insight is appreciated.