March 22, 20206 yr 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, 20206 yr by mike_j1
March 22, 20206 yr Community Expert 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.
March 22, 20206 yr Author 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, 20206 yr by mike_j1
March 22, 20206 yr Community Expert raid1 will have some write performance as a single drive, it just adds redundancy, raid0 will be faster.
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