Hi! We've deployed a new flash only ceph cluster running Nautilus and I'm currently looking at any tunables we should set to get the most out of our NVMe SSDs. I've been looking a bit at the options from the blog post here: https://ceph.io/community/bluestore-default-vs-tuned-performance-comparison/ with the conf here: https://gist.github.com/likid0/1b52631ff5d0d649a22a3f30106ccea7 However some of them, like checksumming, is for testing speed only but not really applicable in a real life scenario with critical data. Should we stick with defaults or is there anything that could help? We have 256GB of RAM on each OSD host, 8 OSD hosts with 10 SSDs on each. 2 osd daemons on each SSD. Raise ssd bluestore cache to 8GB? Workload is about 50/50 r/w ops running qemu VMs through librbd. So mixed block size. 3 replicas. Appreciate any advice! Kind Regards, -- David Majchrzak _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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