https://forum.asrock.com/ Copyright (c) 2006-2013 Web Wiz Forums - All Rights Reserved. Tue, 21 Apr 2026 10:20:25 +0000 Sat, 29 Dec 2018 03:13:49 +0000 http://blogs.law.harvard.edu/tech/rss Web Wiz Forums 12.04 360 https://forum.asrock.com/RSS_post_feed.asp?TID=10553 https://forum.asrock.com/forum_images/web_wiz_forums_black.png https://forum.asrock.com/ https://forum.asrock.com/forum_posts.asp?TID=10553&PID=59432&title=x399-raid-low-performance#59432 Author: Pape
Subject: 10553
Posted: 29 Dec 2018 at 3:13am

Decided to test all 3 drives in AHCI and found out that slots 2 & 3 bench at 2.5K read. Slot 1 reach the 3.1K, this is in specs.

According to Samsung Magician all 3 drives are set to PCIe Gen 3 at 4X in good condition running the latest Firmware.

Will need to go dig down in the hardware....

The question continue to hold: any of you have a clue what can cause this ?]]> Sat, 29 Dec 2018 03:13:49 +0000 https://forum.asrock.com/forum_posts.asp?TID=10553&PID=59432&title=x399-raid-low-performance#59432 https://forum.asrock.com/forum_posts.asp?TID=10553&PID=59428&title=x399-raid-low-performance#59428 Author: Pape
Subject: 10553
Posted: 29 Dec 2018 at 2:17am

HI,

Last week I decided to build a NVME raid of 3 drives and the result is subpar.

The system is:
Taichi x399. bios 3.30
Threadripper 1900x
32 GB g-skill at 2400
3 X Samsung 960 evo.

I performed single drive bench in ahci reaching the advertised speed from the drive. I enable the raid controller and do a single drive JBOD my performance on read drop to 2100 instead of the normal 3k. Write stay the same. If I do a 2 drives bench I have the normal 3.6K write and 4.2k read. If I do 3 drives I get 5.4K write and 6.2 read.

As you can see everything is consistent in number of drives and performance except I miss 1k in read for each drive in raid mode.

Any one got a idea why I have 3k read performance missing in my raid ?

]]> Sat, 29 Dec 2018 02:17:09 +0000 https://forum.asrock.com/forum_posts.asp?TID=10553&PID=59428&title=x399-raid-low-performance#59428