Given that servers with 64 CPU cores (128 threads @ 2.7GHz) and up to 2TB RAM - as well as 12TB HDDs - are easily available and somewhat reasonably priced I wonder what's the maximum number of OSDs per OSD server (if using 10TB or 12TB HDDs) and how much RAM does it really require if total storage capacity for such OSD server is on the order of 1,000+ TB - is it still 1GB RAM per TB of HDD or it could be less (during normal operations - and extended with NVMe SSDs swap space for extra space during recovery)?
Are there any known scalability limits in Ceph Luminous (12.2.2 with BlueStore) and/or Linux that'll make such high capacity OSD server not scale well (using sequential IO speed per HDD as a metric)?
Thanks.
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