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That reminds me that I need to enable TRIM on my Ubuntu SSD. I usually do it, but I had forgot to do it with my recent install. I've used this article in the past (http://www.howtogeek.com/62761/how-to-tweak-your-ssd-in-ubun...). It is fun to measure your IOPS before and after.

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That article suggests enabling automatic trim with the discard option, but that's not recommended any longer.

A more up to date article: http://askubuntu.com/questions/18903/how-to-enable-trim

That article is useless for dm-crypt encrypted volumes.

You have to disable TRIM on the encrypted filesystem with the discard option in crypttab and then set issue_discards to true in lvm.conf.

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