Ubuntu – On ubuntu 14.04 how do you check if TRIM is on for an SSD drive

To see the details for your weekly cron jobs, change directory to /etc/cron.weekly or include it in the command as below:

more /etc/cron.weekly/fstrim 

You should see an output which looks something like:

#!/bin/sh
# trim all mounted file systems which support it
/sbin/fstrim --all || true

If this is present trim is active/checked and executed once a week. The help on this command will show you...

fstrim --help

Usage:
 fstrim [options] <mount point>

Options:
 -a, --all           trim all mounted filesystems that are supported
 -o, --offset <num>  the offset in bytes to start discarding from
 -l, --length <num>  the number of bytes to discard
 -m, --minimum <num> the minimum extent length to discard
 -v, --verbose       print number of discarded bytes

 -h, --help     display this help and exit
 -V, --version  output version information and exit

To see if trim is supported (change sda if you have more than 1 disks):

sudo hdparm -I /dev/sda | grep "TRIM supported"

and it should show something similar to this:

*   Data Set Management TRIM supported (limit 8 blocks)