2RU SuperMicro server with 24xSSD with FreeNAS raid10 or raidz2 exporting volumes via iScsi.
Separately I'm using a FreeNAS controller with 4 SAS HBAs supporting 3 JBODs with 45 8TB HGST He8 near line SATA disks each (135 disks or ~1PB) for backups and slow data.