[ceph-users] Ceph osd will not start.

I'm attempting to get get ceph up and running, and currently feel like I'm going around in circles. I'm attempting to use cephadm and Pacific, currently on debian buster, mostly because centos7 ain't supported any more and cenotos8 ain't support by some of my hardware. Anyway I have a few nodes with 59x 7.2TB disks but for some reason the osd daemons don't start, the disks get formatted and the osd are created but the daemons never come up. They are probably the wrong spec for ceph (48gb of memory and only 4 cores) but I was expecting them to start and be either dirt slow or crash later, anyway I've got upto 30 of them, so I was hoping on getting at least get 6PB of raw storage out of them. As yet I've not spotted any helpful error messages. This is for a archive / slow ceph cluster so I'm not expecting speed. Thanks in advance. Peter.