Hi all,

a lot of users currently switching from SATA hard disc drives to SATA Solid State Disc Drives.
So I also bought a Crucial M4 64GB SSD and installed OpenElec on it (Eden-built: OpenELEC-Ultra.x86_64-devel-20120302013700-r9963). As Skin I'm using the Back Row Skin which fits perfect to my Home-Cinema.

Now the question for me is how to activate TRIM on the SSD.
I searched the forum and found different answers and different settings.
Could someone help me in summarizing the stuff to get a general workflow for all OpenElec users?
In the Xtreamer Ultra BIOS I have switched the SATA support from "IDE" to "AHCI".

What I know so far:

1. The OpenElec kernel (in Dharma/Eden builts) is supporting TRIM/DISCARD, but it's not activated by default. The reason is not known to me.

2. I have to add TRIM/DISCARD commands/parameters somehow in a configfile, maybe autostart.sh.
autostart.sh is located in /storage/.config/autostart.sh. This should be equal to create a autostart.sh file in "\\OPENELEC\Configfiles" (in the windows explorer)

3. I found following autostart.sh commands so far:It was also mentioned to avoid the usage of the discard option and to use fstrim instead:
4. In another thread I found tunefs commands instead of the above autostart commands:
Now I have a lot of information but no exact way to activate TRIM.
Any ideas HOW activating TRIM on SSDs step by step?

Best regards,
Nitropenda

Enable the Trim Support On setup via tunefs.
Some informations available in the Manual Installation Link in my signature.

Because you Need only to Set it One Time with this Solution .

According to some benchmarks on the net the discard option *might* lead to some nasty performance drops on your fs in some cases. Some people say it may even damage the SSD (which I do not believe myself to be frankly). Thats probably also the reason why discard option is not used by default in most linux distros.
I guess the actual effects for you depend on your SSD-chipset/firmware and maybe other factors.
So I think the only way to know for sure if its ok for you to use the discard option without disadvantages is running some benchmarks yourself.

To be on the safe side I am personally using the method of running a manual fstrim on boot up like the second part of your point (3). I didnt encounter any drawbacks yet.

I guess you can ask 5 different people on that topic and you get 5 different answers. Some people even say that TRIM is not needed anymore for recent OSs/SSDs. So there is not THE right way I am afraid. You will have to decide for yourself.

Thanks for both statements.

So it's possible to run a "manual" trim by unsing the fstrim command and add this to the autostart.sh.
To be on the safe side:
I open "\\OPENELEC\Configfiles" in the windows explorer and create the file autostart.sh with the following content:
But at which time fstrim is running then? At the startup procedure or later?
Is the sleep command necessary? Does this sleep command increase the boot-up time?

Nitropenda

Nitropenda wrote: It will run the fstrim once at system startup. The purpose of the sleep is to no interfere with all the other processes that start at the same time. So actually fstrim will be executed 30 seconds after the system startup.
It will not increase boot time because of the '&' at the end of the command. This tells the shell to execute it in the background (not blocking the executing shell). So if you execute the script yourself from the command line you should immediately return to the command line. When you look into your process list you will see a process that sleeps for 30 seconds and then executes the fstrim.

Btw I think I had the script wrong in the other thread, sorry. The actual script needs to look like this:

Hello,

I believed that TRIM was enabled by default if Openelec detects an ssd :
-> See 4th line in this post:
openelec.tv/forum/14-general-help-and-su...ssd-good-idea-#12132

So ?

Thanks