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=/dev/sdb --block-db
/dev/nvme0n1p1 $HOSTNAME
$ ceph-deploy osd create --bluestore --data=/dev/sdc --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=/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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