Actually standalone WAL is required when you have either very small fast
device (and don't want db to use it) or three devices (different in
performance) behind OSD (e.g. hdd, ssd, nvme). So WAL is to be located
at the fastest one.
For the given use case you just have HDD and NVMe and DB and WAL can
safely collocate. Which means you don't need to allocate specific volume
for WAL. Hence no need to answer the question how many space is needed
for WAL. Simply allocate DB and WAL will appear there automatically.
Yes, i'm surprised how often people talk about the DB and WAL separately for no good reason. In common setups bluestore goes on flash and the storage goes on the HDDs, simple.
In the event flash is 100s of GB and would be wasted, is there anything that needs to be done to set rocksdb to use the highest level? 600 I believe
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