mike_j1 Posted March 22, 2020 Share Posted March 22, 2020 (edited) Huy guys, I hope someone can halp me. I did my best to search the forum, but i could not find a solution. I have two ssd's in a raid 1 cache pool. When i do a write test onto /mnt/cache using dd (10GB) i get a write speed of 80MB/s and thats after a manual rebalance and a manual trim, before that it was even worse. One of the ssd's is connected using a usb adapter and one is a m.2 drive. I know this setup is not ideal but i still would expect at least 200mb/s or am i wrong? I'll atach a diagnostic zip so you can better understand my configuration. Thanks in advance for helping! nas-diagnostics-20200322-1400.zip Edited March 22, 2020 by mike_j1 Quote Link to comment
JorgeB Posted March 22, 2020 Share Posted March 22, 2020 That looks about right to me considering the SSDs used, you need faster 3D TLC SSDs (860EVO, MX500, WD Blue 3D, etc), also higher capacity models, at least 250GB to get better than that. 1 Quote Link to comment
mike_j1 Posted March 22, 2020 Author Share Posted March 22, 2020 (edited) Really? Shouldn't raid 1 be the same performance than a single drive? Because the individual drives are way faster. Even the array is faster than the cache... Edited March 22, 2020 by mike_j1 Quote Link to comment
JorgeB Posted March 22, 2020 Share Posted March 22, 2020 raid1 will have some write performance as a single drive, it just adds redundancy, raid0 will be faster. Quote Link to comment
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