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How to accurately measure the speed of a SSD in a NAS? The night I dropped from 230MB/s to 80MB/s, I figured out whether I was measuring the cache or the disk.
On the SSD in the NAS, Windows copies a large file at 230MB/s, but BT download only leaves 80MB/s overnight. Is the drive broken or is the test wrong? This article explains how the cache layer deceives the speed test, what the three commands hdparm, dd, and fstrim measure respectively, how to configure the download disk buffering and TRIM, and attaches the actual measurement data of my N100 Feiniu for a year and a half. ...
