Hello everyone, I'm trying to understand the CPU requirements for recent versions of CEPH. Reading the documentation (https://docs.ceph.com/en/latest/start/hardware-recommendations/) I cannot get any conclusion about how to plan CPUs for ceph. There is the following statement: "With earlier releases of Ceph, we would make hardware recommendations based on the number of cores per OSD, but this cores-per-osd metric is no longer as useful a metric as the number of cycles per IOP and the number of IOPS per OSD. For example, with NVMe OSD drives, Ceph can easily utilize five or six cores on real clusters and up to about fourteen cores on single OSDs in isolation. So cores per OSD are no longer as pressing a concern as they were. When selecting hardware, select for IOPS per core." How should I understand this? On one side it's saying "with NVMe OSD drives, Ceph can easily utilize five or six cores on real clusters" and then continues: "and up to about fourteen cores on single OSDs in isolation." so should I cont 5/6 cores per NVMe OSD or 14cores? And after all that there's the next sentence that says: " So cores per OSD are no longer as pressing a concern as they were.", But if a single OSD can consume 5/6 cpu cures (that could go up to 14) then I would assume that cores per OSD is still an important concern. Can anyone explain these CPU requirements? Or point me to some other documents that describes in more details the resources required for Ceph? Thank you, Laszlo _______________________________________________ ceph-users mailing list -- ceph-users@xxxxxxx To unsubscribe send an email to ceph-users-leave@xxxxxxx
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