SSD TRIM and Dual-Drive Hybrid Systems on Linux

If your SSD support TRIM but still becomes slower after long run, try to check if you have enable it in Linux. In some case, you need to manually TRIM these in offline mode.

You may use it as a single drive or mixed with hard drive as a dual drive hybrid systems on Linux.

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How To Get Running On QNAP Storage Devices To TRIM SSDs?

Maybe that’s why the SSD write test on TS-112 and TS119PII are slower than traditional hard drive. Need to enable trim in QNAP. For Linux kernel 2.6.33, trim is disabled by default.


Since I stick my Intel SSD X25-M G2 160GB into my QNAP TS-459 Pro the performance started to decrease due to the absence of a garbage collector, aka TRIM.

Indeed if a SSD doesn’t trim, then every write to a previously written block must first be read, erased, modified, and re-written to the same location thus crippling write performance.

Since I have run quite some benchmark tests, and massively copied large files such .vmdk and .iso files and deleted them all afterward, the write performance got lower and lower.

My TS-459 runs a Linux QNAPNAS02 which does support natively TRIM function but I was sad to learn that while it’s available, it is not used at all because it is inadequate for today’s real TRIM hardware. This is not a QNAP problem but an issue with the Linux kernel developers. In the interim Mark Lord, who’s by the way one…

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