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.sch...@tu-dortmund.de> 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=/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 <mailto: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 <mailto:ceph-users@lists.ceph.com> > > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com > > > > -- > > > > João Paulo Sacchetto Ribeiro Bastos > > +55 31 99279-7092 <+55%2031%2099279-7092> > > > _______________________________________________ > ceph-users mailing list > ceph-users@lists.ceph.com > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com > -- João Paulo Bastos DevOps Engineer at Mav Tecnologia Belo Horizonte - Brazil +55 31 99279-7092
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