block db sizing and calculation

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Hello,

i'm plannung to split the block db to a seperate flash device which i
also would like to use as an OSD for erasure coding metadata for rbd
devices.

If i want to use 14x 14TB HDDs per Node
https://docs.ceph.com/docs/master/rados/configuration/bluestore-config-ref/#sizing

recommends a minimum size of 140GB per 14TB HDD.

Is there any recommandation of how many osds a single flash device can
serve? The optane ones can do 2000MB/s write + 500.000 iop/s.

Greets,
Stefan
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