Hi, what is the current CPU recommendation for storage nodes with multiple HDDs attached? In the hardware recommendations [1] it says "Therefore, OSDs should have a reasonable amount of processing power (e.g., dual core processors).", but I guess this is for servers with a single OSD. How many cores and GHz should I calculate for storage nodes with 24 HDDs attached (one OSD per HDD)? And what about hyper threading? In the current setup we have 2x Xeon E5-2630 v3, 2.40GHz (in total 16 cores per server, 32 with hyper threading), which works under normal workloads. But when an entire node is down for about 10-20 minutes and then up again, OSDs of all servers in the cluster start flapping (and all cores are at 100%). Either the CPUs don't have enough power or we hit a bug in Ceph (11.2.0). [1] http://docs.ceph.com/docs/kraken/start/hardware-recommendations/ Thanks, Andreas
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