Am 6/23/25 um 22:37 schrieb Ryan Sleeth:
I am setting up my first cluster of 9-nodes each with 8x 20T HDDs and 2x 2T NVMes. I plan to partition the NVMes into 5x 300G so that one partition can be used by cephfs_metadata (SSD only), while the other 4x partitions will be paired as db devices for 4x of the HDDs.
Check if the NVMe devices support multiple namespaces. https://narasimhan-v.github.io/2020/06/12/Managing-NVMe-Namespaces.html This way the kernel sees two block devices for each NVMe controller. This makes it easier with the cephadm orchestrator to deploy NVMe OSDs on the one namespace block device and the RocksDB volumes on the other. Regards -- Robert Sander Linux Consultant Heinlein Consulting GmbH Schwedter Str. 8/9b, 10119 Berlin https://www.heinlein-support.de Tel: +49 30 405051 - 0 Fax: +49 30 405051 - 19 Amtsgericht Berlin-Charlottenburg - HRB 220009 B Geschäftsführer: Peer Heinlein - Sitz: Berlin