Changes between Initial Version and Version 1 of nvme

Timestamp:

02/11/2022 12:11:27 AM (3 years ago)

Author:

Ryan Erbstoesser

Comment:

start nvme page

nvme

@@ +1 @@
+= NVME Solid State Storage 
+
+NVME (nonvolatile memory express) storage is a solid state storage option to be was primarily started for use in consumer laptops but is also able to be used on Gateworks SBCs. 
+
+This is different than mSATA discussed [wiki:sata here]
+
+Note Venice SBCs don't support mSATA, thus the desire for NVME support.
+
+== Signals 
+
+The biggest thing to note about NVME is that it typically uses QTY 4 PCIe lanes for super high speeds. 
+However, Gateworks SBCs have Mini-PCIe slots that have a single PCIe lane. Thus, the speeds are reduced while using the Gateworks SBCs compared to the full potential, but speeds are still very fast at around 225-275MB/s.
+
+== Sizes
+
+Typical NVME sizes are 22mm wide.
+Some lengths quite long, designed for consumer laptops. (80mm long, 2280 defined size)
+These longer sizes are not ideal for the Gateworks SBCs. 
+
+Thus, for a Gateworks SBC, common sizes that would be compatible are a 2230 & 2242
+
+== M.2 Keys
+
+Gateworks has created an M.2 adapter for Mini-PCIe slots, but the first adapter was designed for cellular modems which often take the B-Key.
+
+Most NVME drives are M-Key. Gateworks plans to create an M-Key M.2 adapter for Mini-PCIe. Please contact Gateworks for more information. 
+
+== Speeds
+
+As mentioned above, Gateworks SBCs only expose 1x PCIe lane per slot, thus the speeds achieved will not be the same as on an x86 desktop with a full 4x PCIe lanes.
+
+However, the speeds achieved are still often higher than even the onboard eMMC storage as discussed [wiki:MMC here]
+
+Gateworks has ran some sample speed tests using a GW73xx Venice SBC (PCIe Gen 2) and the following command:
+{{{
+dd if=/dev/nvme0n1 of=/dev/null bs=1M count=500 iflag=nocache
+}}}
+
+||= Drive =||= Speed =||= Notes =|| 
+|| Samsung SSD980 || ~225 Megabytes/sec || 2280 size, no proper adapter ||
+|| Silicon Motion MD681GEDKAF3 || ~240 Megabytes/sec || 2242 size ||
+