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install:ssd [2014/01/13 14:56] admin created |
install:ssd [2014/01/14 00:15] (current) admin [Using a daily cron job] |
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| ===== fstab or cron ? ===== | ===== fstab or cron ? ===== | ||
| ==== Online discard in fstab ==== | ==== Online discard in fstab ==== | ||
| - | There are mainly two ways to use TRIM directly in fstab using online discard, but this seems to be **NOT RECOMMENDED**.\\ | + | Although using online discard (in fstab) seems to be **NOT RECOMMENDED**, in case you really want to use this technique, open /etc/fstab as root with a text editor: |
| - | In case you really want to use this technique, open /etc/fstab as root with a text editor: | + | |
| <code> | <code> | ||
| sudo nano /etc/fstab | sudo nano /etc/fstab | ||
| - | <code> | + | </code> |
| And add the "discard" option (separated by a comma and no space!) to the SSD partitions you want to enable TRIM for. Here's an example: | And add the "discard" option (separated by a comma and no space!) to the SSD partitions you want to enable TRIM for. Here's an example: | ||
| Line 31: | Line 30: | ||
| UUID=1cd2fc4f-7d99-4c7a-8ea7-6f9a2d5e5960 / ext4 discard,errors=remount-ro 0 1 | UUID=1cd2fc4f-7d99-4c7a-8ea7-6f9a2d5e5960 / ext4 discard,errors=remount-ro 0 1 | ||
| </code> | </code> | ||
| + | |||
| + | |||
| + | ==== Using a daily cron job ==== | ||
| + | Using a timed cron job, the SSD trimming will occur on a regular basis you decide of (daily is probably a good choice). **This is the recommended way to TRIM your SSD**. | ||
| + | |||
| + | To use a daily cron job (so the trimming will occur once a day) for TRIM (fstrim), open /etc/cron.daily/trim as root with a text editor (/etc/cron.daily/trim doesn't exist so this will create the file): | ||
| + | <code> | ||
| + | sudo nano /etc/cron.daily/trim | ||
| + | </code> | ||
| + | |||
| + | and paste this: | ||
| + | <code> | ||
| + | #!/bin/sh | ||
| + | LOG=/var/log/trim.log | ||
| + | echo "*** $(date -R) ***" >> $LOG | ||
| + | fstrim -v / >> $LOG | ||
| + | fstrim -v /home >> $LOG | ||
| + | </code> | ||
| + | |||
| + | The last two commands in the code above perform the actual trimming for the root (/) and home (/home) partition and you need to edit them: here, add the SSD partitions for which you want to enable the daily TRIM job (usually, you must add "/" if the root partition is on the SSD and "/home" if you've set up a separate home partition). | ||
| + | |||
| + | Before saving the file, you can check if the fstrim command works: | ||
| + | <code> | ||
| + | sudo fstrim -v / | ||
| + | </code> | ||
| + | |||
| + | The output should look similar to this: | ||
| + | <code> | ||
| + | sudo fstrim -v / | ||
| + | /: 8158715904 bytes were trimmed | ||
| + | </code> | ||
| + | |||
| + | Once you've added your SSD partitions, save the file and make it executable using the following command: | ||
| + | <code> | ||
| + | sudo chmod +x /etc/cron.daily/trim | ||
| + | </code> | ||
| + | |||
| + | The system executes the daily cron (using anacron, even if your computer is turned off at that time, the job will still be performed later on) jobs at around 06:25 so each day after that time, you can check the /var/log/trim.log log file to see the fstrim output. | ||
| + | |||
| + | reference: [[http://www.webupd8.org/2013/01/enable-trim-on-ssd-solid-state-drives.html]] | ||
