1769-L23-QBFC1B產(chǎn)品操作
1769-L23-QBFC1B
最近做了個(gè)NVME4.0的一致性測(cè)試夾具如下圖，SFF8639接口，PCIE的傳輸模式，現(xiàn)在捋一捋這三位啥關(guān)系。
先說接觸最廣的PCIE，這個(gè)不難理解，這個(gè)是總線標(biāo)準(zhǔn)，X1,X4,X8,X16，外形啥樣，當(dāng)然是金手指，但是左邊那個(gè)金手指好像不是PCIE的接口，這個(gè)時(shí)候就要來說SFF8639，其實(shí)這個(gè)SFF8639就是我們經(jīng)常說的U.2接口，不用解釋，看著就是給硬盤用的。
為什么它和PCIE扯上關(guān)系，我們看下接口定義
有管腳定義是ePCIETransmit或者receiver，這也就是PCIE協(xié)議的傳輸通道，所以在這里SFF8639是個(gè)接口，可以通過這個(gè)接口走PCIE的信號(hào)，一點(diǎn)不矛盾。你也可以把這個(gè)接口換成M.2或者直接換成PCIE的金手指，沒任何問題，無非就是外形變了，走的還可以是PCIE信號(hào)，不止如此，我們看信號(hào)定義發(fā)現(xiàn)它也支持SAS。
最后來說NVME，NVME其實(shí)是個(gè)通信協(xié)議，全稱是NonvolatileMemoryExpress（非易失性存儲(chǔ)），聽名字就知道是個(gè)軟件東東，所以你可以把它和硬件分開。
從圖上看到，它本質(zhì)是上建立了多個(gè)計(jì)算機(jī)與存儲(chǔ)設(shè)備的通路，這樣搬運(yùn)數(shù)據(jù)的速度自然就提高了。在NVMe協(xié)議中，多個(gè)通路其實(shí)就是多個(gè)隊(duì)列，而在SATA中計(jì)算機(jī)與存儲(chǔ)設(shè)備只能有一個(gè)隊(duì)列，即使是多CPU情況下，所有請(qǐng)求只能經(jīng)過這樣一個(gè)狹窄的道路。而NVMe協(xié)議可以最多有64K個(gè)隊(duì)列，每個(gè)CPU或者核心都可以有一個(gè)隊(duì)列，這樣并發(fā)程度大大提升，性能也自然更高了。
1769-L23-QBFC1B
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