I used to create Bluestore OSDs using commands such as this one:

ceph-volume lvm create --bluestore --data ceph-block-50/block-50 --block.db
ceph-db-50-54/db-50

with the goal of having  block.db and wal.db co-located on the same LV
(ceph-db-50-54/db-5 in my example, which is on a SSD device).

Is still still true that, if the wal location is not explicitly specified,
it goes together with
the db, as stated e.g. in:

https://lists.ceph.io/hyperkitty/list/ceph-users@ceph.io/thread/CBMWLN3CJCMR2PGZETPKGZZFZJ4HP6N7/

?

I can't find this information in the latest doc (I am reading
https://docs.ceph.com/en/quincy/ceph-volume/lvm/prepare/#bluestore)

Thanks, Massimo
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