On 18.01.19 11:48, Eugen Leitl wrote: > OSD on every node (Bluestore), journal on SSD (do I need a directory, or a dedicated partition? How large, assuming 2 TB and 4 TB Bluestore HDDs?) You need a partition on the SSD for the block.db (it's not a journal anymore with blustore). You should look into osd_memory_target to configure the osd process with 1 or 2 GB of RAM in your setup. > Can I run ceph-mon instances on the two D510, or would that already overload them? No sense to try running 2x monitors on D510 and one on the 330, right? Yes, Mons need some resources. If you have set osd_memory_target they may fit on your Atoms. > I've just realized that I'll also need ceph-mgr daemons on the hosts running ceph-mon. I don't see the added system resource requirements for these. The mgr process is quite light in resource usage. > Assuming BlueStore is too fat for my crappy nodes, do I need to go to FileStore? If yes, then with xfs as the file system? Journal on the SSD as a directory, then? Journal for FileStore is also a block device. Regards -- Robert Sander Heinlein Support GmbH Schwedter Str. 8/9b, 10119 Berlin https://www.heinlein-support.de Tel: 030 / 405051-43 Fax: 030 / 405051-19 Amtsgericht Berlin-Charlottenburg - HRB 93818 B Geschäftsführer: Peer Heinlein - Sitz: Berlin
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