[solved] enable trim on ssd

this link from the wiki says i should edit my /etc/fstab in order to enable trim on my ssd.
this is my /etc/fstab
# /etc/fstab: static file system information
# <file system> <dir> <type> <options> <dump> <pass>
# UUID=6b44daaa-610c-4f23-a632-569d091e4d43
/dev/sda1 / ext4 rw,relatime,data=ordered 0 1
should i replace 'rw,relatime,data=ordered' with 'defaults,noatime,discard' or appent 'discard' to the options?
Last edited by aldoiljazi (2013-09-18 19:42:05)

@ploub, thanks!
another thing i want to make sure is trim support for my ssd. i have this one. the 64gb version.
i don't seem to find a certain source online, even the sandisk's page doesn't mention anything.
is there a test i can run?
edit: it does support trim, just for reference i used "hdparm -I /dev/yourssd" as root and i got:
Data Set Management TRIM supported (limit 8 blocks)
somewhere in the output.
Last edited by aldoiljazi (2013-09-18 19:41:42)

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Enable TRIM on SSD Mac OS X Mountain Lion

I recently purchased and installed a Samsung SSD 840 Pro series on my MacBook Pro. I was reading up on SSDs and I heard something about enabling TRIM and how it makes the SSD last longer. How can I enable TRIM on my SSD on my MacBook Pro that's running Mac OS X Mountain Lion?

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It's a real shame Apple doesn't automatically enable TRIM on non-Apple SSD's, it knows when it formats it that it's one as it won't enable scrubbing.
http://www.mactrast.com/2011/07/how-to-enable-trim-support-for-all-ssds-in-os-x- lion/
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This type of question has been asked a lot of times, I know, but I would like to receive some advice from experts.
Few weeks ago I installed my Samsung SSD 840. People say that it's not necessary to enable TRIM for such type of SSD. Others say that it allows to maintain the life of the SSD. So, what do you think about? What way to follow?
Note that in this case TRIM would be enabled by third part apps (TRIM enabler or Chameleon) and not by Apple.
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TRIM does not improve performance. Do a google search for TRIM and read up on it. Is it necessary and a good thing to have enbled? I say yes it is even if the drive does some garbage collection. If TIRM was not needed or not good for the drive apple would not auto enable it on ssd's that are branded by apple. Neither would windows 7 auto enable trim when windows sees a ssd installed.
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Kappy,
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[solved] Best Practice for SSDs with crypto on it regarding TRIM

Hi,
I was doing some research on this matter but did not find too much information on that that's more useful than confusing.
The setup is the following: I have an SSD (Crucial, Marvell-Controller) with two partitions: a small one for /boot and a bigger one for the rest, which is a LUKS-Container. I left some unpartitioned space at the end of the SSD. I'd like to *not* enable TRIM on the LUKS-device for security purposes.
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Last edited by Ovion (2015-03-09 19:20:13)

I have the same setup. Crucial SSD, LUKS, TRIM (cron.weekly fstrim). A full hexdump (minus gigabytes of random data) looks like this: https://bpaste.net/raw/505157 (tell me about it)
There is no issue with security. At least, none I care about. So the attacker can see how much free space there is [and where]. The where part is important since lots of small files give a different picture [lots of small free spaces in between] than a single very large file would [no free space in between], assuming there is no fragmentation worth mentioning [which Linux filesystems are usually good at]. So an attacker could probably make some guesses about your amount of data and file sizes. On the other hand I don't see how that's important, in ecryptfs you get this kind of info for free, and I have all sorts of files in all sorts of sizes either way, so it's not a big secret.
The question is, when all it takes to crack your encryption setup is a keylogger or a $5 encryption wrench, does it really matter?
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As for unpartitioned space, if it ever was in use before, you need to trim it once. Create a partition on it, then blkdiscard the partition, then delete the partition. That way it's good until it's "in use" again because you dd all over it or had it resynced in a RAID.
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Last edited by frostschutz (2015-03-09 19:19:16)

So I've changed my hard drive for an ssd and now I've been told to enable trim now I've got the apple cover will they show me how to enable it with out some program of the internet ?

so I've changed my hard drive for an ssd and now I've been told to enable trim ? now I've got the apple cover will they show me how to enable it with out some program of the internet ?

Use an app called chameleon ssd optimizer.
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here's the pic of my system info:
[URL=http://imageshack.us/photo/my-images/692/screenshot20130326at249.png/][IMG]http://img692.imageshack.us/img692/3509/screenshot20130326at249.png[/IMG][/URL]
Uploaded with [URL=http://imageshack.us]ImageShack.us[/URL]
as u can see it is an apple ssd....it's something that i got from a friend that is a servicer here..
anyway...he doesn't know how it work's...

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This question was solved.
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You are welcome
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http://digitaldj.net/2011/07/21/trim-enabler-for-lion/
I ran the series of commands on my Mac Pro and it did enable TRIM.
the webpage even has a backup/back-out procedure.
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[solved] enable trim on ssd

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