harald.freidhof@gmail.com (harald.freidhof) writes:
1. shoud i use a raid controller a create for example a raid 5 with all disks on each osd server? or should i passtrough all disks to ceph osd?
Set up the raid controller in JBOD mode, and passthrough the disks.
2. if i have a 2 pyhsicaly node osd cluster, did i need 3 physicall mons?
You can colocate mons on OSDs as long as you have enough RAM - you may need to run a third mon somewhere else to have a quorum. Also, 2 node cluster isn't recommended at all. 3 for testing is fine or a backup/replication site, better 5 or more.
3. if i have a 3 physically node osd cluster, did i need 5 physicall mons?
No, you'll be fine with 1 or 3 mons (although 1 would be risky)
3. where i should in install the mgr? on osd or mon
You could put the mgr on a osd, it is used mostly for statistics and some housekeeping tasks, but not "critical".
4. where i should in install the rgw? on osd or mon OR on 1 or 2 separate machines?
I don't run RGW so I won't comment.