Hello Oliver,
-- As far as I know yet, you can use the same DB device for about 4 or 5 OSDs, just need to be aware of the free space. I'm also developing a bluestore cluster, and our DB and WAL will be in the same SSD of about 480GB serving 4 OSD HDDs of 4 TB each. About the sizes, its just a feeling because I couldn't find yet any clear rule about how to measure the requirements.
* The only concern that took me some time to realize is that you should create a XFS partition if using ceph-deploy because if you don't it will simply give you a RuntimeError that doesn't give any hint about what's going on.
So, answering your question, you could do something like:
$ ceph-deploy osd create --bluestore --data="" --block-db /dev/nvme0n1p1 $HOSTNAME
$ ceph-deploy osd create --bluestore --data="" --block-db /dev/nvme0n1p1 $HOSTNAME
On Fri, May 11, 2018 at 10:35 AM Oliver Schulz <oliver.schulz@xxxxxxxxxxxxxx> wrote:
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="" HOSTNAME
ceph-deploy osd create --bluestore --osd-db=/dev/nvme0n1p2
--data="" HOSTNAME
...
Or do I need to use osd-db=/dev/nvme0n1p2 for data=""> osd-db=/dev/nvme0n1p3 for data="" 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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