Eugen you beat me!!! On Thu, Aug 16, 2018 at 6:37 PM, Satish Patel <satish.txt@xxxxxxxxx> wrote: > I am new too but i had same question and this is my opinion (i would > wait for other people to correct me or add more) > > A1. I didn't find any formula but i believe 10 to 20G is more than > enough for each OSD ( there are some variation like how long you going > to hold data etc..) > > A2. basic rule is 5 OSD per SSD & ~15 OSD per NVMe SSD > > A3. I don't know > > Again bluestore is different if you have all SSD then you can keep > WAL+DB on same disk ( Or if you have all SSD + NVMe then put WAL+DB in > NVMe) > > > > > 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? >> >> 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
 |