Shared WAL/DB device partition for multiple OSDs?

Oliver Schulz <oliver.schulz@xxxxxxxxxxxxxx> · Fri, 11 May 2018 15:35:33 +0200

Dear Ceph Experts,

I'm trying to set up some new OSD storage nodes, now with
bluestore (our existing nodes still use filestore). I'm
a bit unclear on how to specify WAL/DB devices: Can
several OSDs share one WAL/DB partition? So, can I do

    ceph-deploy osd create --bluestore --osd-db=/dev/nvme0n1p2 
--data=/dev/sdb HOSTNAME

    ceph-deploy osd create --bluestore --osd-db=/dev/nvme0n1p2 
--data=/dev/sdc HOSTNAME

    ...

Or do I need to use osd-db=/dev/nvme0n1p2 for data=/dev/sdb,
osd-db=/dev/nvme0n1p3 for data=/dev/sdc, and so on?

And just to make sure - if I specify "--osd-db", I don't need
to set "--osd-wal" as well, since the WAL will end up on the
DB partition automatically, correct?

Thanks for any hints,

Oliver
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