Issues relating to HDD Installs. Once you have installed Knoppix, it basicly becomes debian, so you should check out www.debian.org for information.
Dell Poweredge R630 2x Xeon E5-2680 v4 2.4ghz 28-Cores / 128gb / H330 / 2x 1TB
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Dell Poweredge R730xd LFF 14-Bay 2U Server | Choose Your CPU & RAM Config
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2U 12 Bay SAS3 SuperMicro Server 6028U-TR4T+ W/ X10DRU-i+ Barebone 12 Caddy RAIL
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Dell Poweredge R210 II Server Xeon E3-1220 v2 3.1ghz Quad Core / 16gb / 1x Tray
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Dell PowerEdge R620 Server 2x E5-2660 v2 2.2GHz 20 Cores 256GB RAM 1x 480GB SSD
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Dell PowerEdge R730XD 28 Core Server 2X Xeon E5-2680 V4 H730 128GB RAM No HDD
$389.99
Dell PowerEdge R620 Server - 256GB RAM, 2x8cCPU, 120Gb SSD/3x900Gb SAS, Proxmox
$320.00
SuperMicro Server 505-2 Intel Atom 2.4GHz 8GB RAM SYS-5018A-FTN4 1U Rackmount
$202.49
HP ProLiant DL360 G9 Server 2.60Ghz 20-Core 64GB 3x 900GB 12G P440ar
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Cisco WSA S390 Server UCS C220 M4 | 1x Xeon E5-2620v3 32GB RAM No Storage
$111.96