you can definitely do this at home on the cheap. As long as you have a decent internet connection, that is ;)
10TB+ harddisks are not expensive, you can put them in an old enclosure together with a small industrial or NUC PC in your basement
I current have 45 WUH721414ALE6L4 drives in a Supermicro JBOD SC847E26 (SAS2 is way cheaper than SAS3) connected to an LSI 9206-16e controller (HCL reasons) via hybrid Mini SAS2 to Mini SAS3 cables. The SAS expanders in the JBOD are also LSI and qualified for the card. The hard drives are also qualified for the SAS expanders.
I tried this using Pine ROCKPro64 to possibly install Ceph across 2-5 RAID1 NAS enclosures. The problem is I can't get any of their dusty Linux forks to recognize the storage controller, so they're $200 paperweights.
I wrote a SATA HDD "top" utility that brings in data from SMART, mdadm, lvm, xfs, and the Linux SCSI layer. I set monitoring to look for elevated temperature, seek errors, scan errors, reallocation counts, offline reallocation, and
probational count.
