I read in one of the webupd8 articles that TRIM support, which was introduced in Ubuntu 14.04, by default only works for Intel and Samsung SSDs. What about other? I am using Dell XPS 13 Dev Edition laptop and the SSD is from a different manufacturer, so does TRIM work by default as well or I have to manually make a cron job file?
Everything is already installed.
The command to activate trim 1 time:
sudo fstrim -v /
It will take a while and then show the results. Example:
sudo fstrim -v /
[sudo] password for rinzwind:
/: 93184647168 bytes were trimmed
And it is set up by default to run once a week for -supported devices-:
$ locate fstrim
/etc/cron.weekly/fstrim
/sbin/fstrim
If you check the cron job it is all explained:
$ more /etc/cron.weekly/fstrim
#!/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 problems 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.
exec fstrim-all
If the manual method works, you can add --no-model-check to the command at the end (exec fstrim-all) for it to activate.
The link in the file is an interesting read. It also has a method to check if your disc is bugged. A lot of the cheaper SSDs are faulty and could destroy data.
And to top it off: this is a list of compatible hardware (PDF download) including SSDs.
There is another method where you add discard to your fstab for permanent trimming. Benchmarks (German) favor fstrim over discard.
