Hello community,
I need your help to understand a little bit more about current MDS architecture.
I have created one node CephFS deployment and tried to test it by fio. I have used two file sizes of 3G and 320G. My question is why I have around 1k+ IOps when perform random reading from 3G file into comparison to expected ~100 IOps from 320G. Could somebody clarify where is read buffer/caching performs here and how to control it?
A little bit about setup - Ubuntu 14.04 server that consists Jewel based: one MON, one MDS (default parameters, except mds_log = false) and OSD using SATA drive (XFS) for placing data and SSD drive for journaling. No RAID controller and no pool tiering used
Thanks
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