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Hi I'm about to change some SATA SSD disks to NVME disks and for CEPH I too would like to know how to assign space. I have 3 1TB SATA OSDs so I'll split the NVME disks in 3 partitions of equal size, I'm not going to assign a different WAL partition because, if the docs are right, the WAL is automatically put in the fastest device. What I can't find is some indication of how much space WAL and
blocks.db are using, so I could tune them better. Il 18/10/2017 08:29, Wido den Hollander
ha scritto:
Thanks for the feedback. Indeed, we have to be cautious in this case. So 6kB/object feels low to you, so it's probably. I'm testing with a 1GB WAL/50GB DB on a SSD with a 4TB disk which seems to hold out fine. It's not that space is a true issue, but "use as much as available" doesn't say much to people. If I have a 1TB NVMe for 10 disks, should I give 100GB of DB to each OSD? It's those things people want to know. So we need numbers to figure these things out. Wido --
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