#1 2016-12-28 12:45:55

Head_on_a_Stick

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From: London

Registered: 2015-09-29

Posts: 9,093

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Solid State Drives and TRIM in BunsenLabs

For users with solid state storage devices, TRIM can be used to inform the drive which storage blocks are no longer in use and can be wiped internally, thus preventing performance hits from spurious over-writes and write amplification.

Verify that your device supports this operation with:

lsblk -D

Then check the DISC-GRAN and DISC-MAX columns -- non-zero values indicate that TRIM can be used.

Whilst it is possible to apply TRIM with the discard filesystem option in /etc/fstab, this can cause a performance degradation because the blocks are discarded with every deletion:

https://patrick-nagel.net/blog/archives/337

https://kparal.wordpress.com/2013/05/10 … l-525-ssd/

Also, with discard enabled, any deleted data is lost completely and instantly and so recovery utilities such as extundelete will not work.

The recommended alternative to this is to apply TRIM periodically using the `fstrim` command.

For BunsenLabs, there is a systemd .timer unit that can be enabled with:

sudo cp /usr/share/doc/util-linux/examples/fstrim.{timer,service} /etc/systemd/system
sudo systemctl enable fstrim.timer

This will then run `fstrim -a` automatically once a week.

To check the status of the .timer, use:

systemctl list-timers

The .timer also integrates with the systemd journal; to view the relevant entries, use:

sudo journalctl -u fstrim.timer

Just to note: any discussion of the issues raised here can be continued in https://forums.bunsenlabs.org/viewtopic.php?id=919

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MsMattie

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Registered: 2015-09-29

Posts: 99

Re: Solid State Drives and TRIM in BunsenLabs

Very helpful and easy to follow tutorial.

I'm wondering if this same procedure would work on other debian or ubuntu distros?

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Head_on_a_Stick

Member

From: London

Registered: 2015-09-29

Posts: 9,093

Website

Re: Solid State Drives and TRIM in BunsenLabs

I'm wondering if this same procedure would work on other debian or ubuntu distros?

Well, it certainly works in Debian:

http://forums.debian.net/viewtopic.php?f=16&t=130965

And Ubuntu also appears to ship those files:

http://packages.ubuntu.com/xenial/amd64 … x/filelist

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