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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