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.sch...@tu-dortmund.de> 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 > _______________________________________________ > ceph-users mailing list > ceph-users@lists.ceph.com > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com > -- João Paulo Sacchetto Ribeiro Bastos +55 31 99279-7092
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