I have installed Ubuntu 14.04 LTS 64bit, and would like to make sure that TRIM is enabled (as much as I know - it is enabled by default). Is there some sort of command which would help me to find out if it is working correctly?
You can perform a sudo fstrim -v / (replace "/" with other mountpoints, if you have any), to check if fstrim gives any errors.
If it doesn't, type in cat /etc/cron.weekly/fstrim which should give you an output like:
#!/bin/sh
# call fstrim-all to trim all mounted file systems which support it
set -e
#
# This only runs on Intel and Samsung SSDs by default, as some SSDs with
# faulty firmware may encounter data loss when running fstrim under high I/O
# load (e. g. https://launchpad.net/bugs/1259829). You can append the
# --no-model-check option here to disable the vendor check and run fstrim on
# all SSD drives Like this (remove the hash):
#exec fstrim-all --no-model-check
exec fstrim-all
If it does, it means, that your Ubuntu automatically recognized that you have an SSD and will trim it once a week as a cron job.
If you like to optimize your system for SSD, check out this article.
