On Ubuntu Linux 12.10 TRIM on filesystem level is not enabled by default (for a good reason!) but also batched discard is not enabled by default.
The German ubuntuusers wiki suggests running a script every day or week. Since I decided that I only wanted this to run if my load is low, because queued TRIM will only be avaliable in SATA 3.1 and running TRIM can block the system.
I decided to run TRIM daily since that would make it run shorter.
So I wrote this little script (Python this time, no other dependencies but the little script mentioned above and a file /var/opt/trim which needs to be existing and non-empty), which will be executed every 3 hours (using cron).
#!/usr/bin/python import os, time TRESH = 1.0 RUN_FILE = "/var/opt/trim" load_1, load_5, load_15 = os.getloadavg() last_run_file=open(RUN_FILE,'r') last_run=int(last_run_file.read()) last_run_file.close() now=int(time.time()) #print last_run if now - last_run > 86400 and load_5 < TRESH: run=1 try: run=os.system('/opt/trim.sh') last_run_file=open(RUN_FILE,'w') last_run_file.write(str(now)) last_run_file.close() except Exception, e: import traceback print traceback.format_exc()