On 23/09/2020 10:54, Marc Roos wrote:
Depends on your expected load not? I already read here numerous of times
that osd's can not keep up with nvme's, that is why people put 2 osd's
on a single nvme. So on a busy node, you probably run out of cores? (But
better verify this with someone that has an nvme cluster ;))
Did you? I just start to though about this idea too, as some devices can
deliver about twice of the own ceph-osd performance.
How they did it?
I have an idea to create a new bucket type under host, and put two LV
from each ceph osd VG into that new bucket. Rules are the same
(different host), so redundancy won't be affected, but doubling number
of ceph-osd daemons can squeeze a bit more iops from backend devices at
expense of doubling Rocksdb size (reducing payload size) and using more
cores.
And I really want to hear all bad things about this setup before trying it.
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