Current configuration:

Hardware

Raspberry Pi 4
    ARMv7 Processor rev 3 (v7l)
    8GB RAM
Storage System via NFS/iSCSI:
    Synology DS918+
        SHR-1
            Hitachi HGST UltraStar 7K4000 3TB (SATA)
            Hitachi HGST UltraStar 7K4000 3TB (SATA)
            Hitachi HGST UltraStar 7K4000 3TB (SATA)
            Hitachi HGST UltraStar 7K4000 3TB (SATA)
        SSD Cache:
            SSD ADATA XPG SX8200 PRO 512 GB M.2 2280 PCI-E x4 Gen3 NVMe
            SSD ADATA XPG SX8200 PRO 512 GB M.2 2280 PCI-E x4 Gen3 NVMe

Software

Raspbian

Past configuration:

Hardware

HP Proliant ML150 G6
    Intel(R) Xeon(R) CPU E5540  @ 2.53GHz
    24GB ECC RAM
    2x750W RPS
    Storage system:
        HP Smart Array P410 Controller + 1024MB Flash Cache (FBWC)
        RAID1 - Logical drive #1
            Hitachi HGST UltraStar 7K4000 3TB (SATA)
            Hitachi HGST UltraStar 7K4000 3TB (SATA)
        RAID1 - Logical drive #2
            Seagate Constellation ES.3 ST1000NM0033 1TB 7200 RPM 128MB (SATA)
            Seagate Constellation ES.3 ST1000NM0033 1TB 7200 RPM 128MB (SATA)
        RAID5 - Logical drive #3
            Seagate Constellation ES.3 ST2000NM0023 2TB 7200 RPM 128MB (SAS)
            Seagate Constellation ES.3 ST2000NM0023 2TB 7200 RPM 128MB (SAS)
            Seagate Constellation ES.3 ST2000NM0023 2TB 7200 RPM 128MB (SAS)
            Seagate Constellation ES.3 ST2000NM0023 2TB 7200 RPM 128MB (SAS)

Software

Oracle Linux with Unbreakable Enterprise Kernel (UEK)