Actually, if you go to https://ceph.com/community/new-luminous-bluestore/ you will see that DB/WAL work on a XFS partition, while the data itself goes on a raw block.
Also, I told you the wrong command in the last mail. When i said --osd-db it should be --block-db.
On Fri, May 11, 2018 at 11:51 AM Oliver Schulz <oliver.schulz@xxxxxxxxxxxxxx> wrote:
Hi,
thanks for the advice! I'm a bit confused now, though. ;-)
I thought DB and WAL were supposed to go on raw block
devices, not file systems?
Cheers,
Oliver
On 11.05.2018 16:01, João Paulo Sacchetto Ribeiro Bastos wrote:
> 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 <mailto: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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> ceph-users@xxxxxxxxxxxxxx <mailto:ceph-users@xxxxxxxxxxxxxx>
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>
> --
>
> João Paulo Sacchetto Ribeiro Bastos
> +55 31 99279-7092
>
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João Paulo Bastos
DevOps Engineer at Mav Tecnologia
Belo Horizonte - Brazil
+55 31 99279-7092
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