This one comes with a motherboard. For a few bucks you could easily turn a number of these into a ceph cluster using those 2.5" disks:
SuperMicro X8DTL-3F 1U Half Depth Server 2.5" SAS / SATA +Trays Homelab Vmware
I got 4 @ $130 ea which I am going to use with some of the Pentium D1500 nodes and those 2.5" Seagate 4TB drives.
This price is about the same as a SC504 new, but with more fans and 8x hot swap bays.
SuperMicro X8DTL-3F 1U Half Depth Server 2.5" SAS / SATA +Trays Homelab Vmware
I got 4 @ $130 ea which I am going to use with some of the Pentium D1500 nodes and those 2.5" Seagate 4TB drives.
This price is about the same as a SC504 new, but with more fans and 8x hot swap bays.