Thanks Satish and Alfredo for your replies. That really helped! On Fri, Aug 17, 2018 at 8:04 AM Alfredo Deza <adeza@xxxxxxxxxx> wrote: > > On Thu, Aug 16, 2018 at 4:44 PM, Cody <codeology.lab@xxxxxxxxx> wrote: > > Hi everyone, > > > > As a newbie, I have some questions about using SSD as the Bluestore > > journal device. > > > > 1. Is there a formula to calculate the optimal size of partitions on > > the SSD for each OSD, given their capacity and IO performance? Or is > > there a rule of thumb on this? > > We recently updated the docs regarding sizing for bluestore: > http://docs.ceph.com/docs/master/rados/configuration/bluestore-config-ref/#sizing > > You will want no less of 4% of your data size for block.db. For a 1TB > data device you will want 40GB for block.db > > > > > 2. Is there a formula to find out the max number of OSDs a single SSD > > can serve for journaling? Or any rule of thumb? > > > > 3. What is the procedure to replace an SSD journal device used for > > DB+WAL in a hot cluster? > > > > Thank you all very much! > > > > Cody > > _______________________________________________ > > ceph-users mailing list > > ceph-users@xxxxxxxxxxxxxx > > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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