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How did they go from 8 SATA ports to 32 SATA devices? The linked cable uses a SAS host/connector. Was a SAS card left out of the parts list?
by rob-olmos 7y ago
How did they go from 8 SATA ports to 32 SATA devices? The linked cable uses a SAS host/connector. Was a SAS card left out of the parts list?
- Tepix 7y agoUsing "8x 4 way SATA data splitters". What i don't get is why they don't use 14TB HDDs, they are only 15% more expensive per TB. On the other hand they'd need 2.33x less PCs at $550 each, plus their power use. So instead of every 7 PCs with 6TB HDDs they'd need 3 with 14TB HDDs. PS: They could also use a mainboard with 10 SATA ports instead of 8. They are only $15 more than the chosen board. Adding one or more PCIe 8x SATA controller cards might also make sense, depending on the average load of a system.
- pbhjpbhj 7y ago6TB might be the most reliable at the time the decision was made.
- zaroth 7y ago> Using "8x 4 way SATA data splitters". There's no such thing as a passive SATA data splitter.
- tracker1 7y agoit's probably a SAS/Sata controller, and the sas interface split to 4x sata.
- zaroth 7y agoThey do link to the motherboard they are talking about, and it doesn't have SAS.
- tracker1 7y agoThey mention 8 pcie slots with 48 pcie lanes... I'm presuming they are filling them with sas/sata controllers.
- hddherman 7y ago> 48 PCIe lanes PCIe lane count depends on CPU support, for AM4 I believe it ranges from 6x PCIe 3.0 (cheapest AMD Athlon/Ryzen CPU-s with integrated GPU) to 24 (PCIe 4.0 for latest Zen 2 based Ryzen 3000 series). The CPU they list in the article supports 16 lanes of PCIe 3.0 connectivity + 4 lanes for chipset (storage and other IO). Nowhere near the 48 PCIe lanes you mention, although you could argue that 20+4 lanes of PCIe 4.0 bandwidth is equal to 48 lanes of PCIe 3.0 bandwidth, but this would require a compatible CPU, which would increase the cost by hundreds of dollars.
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