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How to: NVMe RAID setup on Supermicro Z370 boards (Page 4)

By Steven Bassiri from Jan 30, 2018 @ 17:55 CST

RAID Results and M.2 Types

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On the left, we have one KC1000 for comparison, and on the right, we have our performance on our RAID 0 array. We aren't able to double our sequential speeds because of the DMI's 3.5GB/s limit, but we do see noticeably higher sequential speeds. We also see that our 4K reads/write didn't take a hit but remained roughly the same, which is typical of a RAID0 array.

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Going a bit off topic, not all of SuperMicro's (and other vendors) motherboards have their M.2 slots directly routed to the PCH like on the motherboard we used. Many motherboards (most) have M.2 slots that share bandwidth with other devices (mostly SATA or an x4 PCI-E slot). We wanted to see if the different types of M.2 drive connections interfered with drive performance. Quick switches can cause performance to drop a tiny bit, but let's see how much, just for fun!

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We took another brand's motherboard and ran it through the same tests using Anvil Storage benchmark, which is a bit tougher on the drives than CrystalDiskMark. The 'Two Shared + One Linked' should provide the best results, and the 'All Shared + Two Shared', which goes through the most switches, should produce worse results. We see that sequential and 4K writes actually seem to take a small hit, while reads don't really change. Overall though, we found that the types of M.2 slots aren't super important, but if you know the path your M.2 slots data travels, it's best to take the most direct route to the PCH.

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