To prevent the dwindling of these enhancements to daily computing life we rely on TRIM. Trim is not an acronym, although it is commonly thought of as one. Trim is a command used by the operating system to inform the SSD of unused data blocks that can be deleted.
This helps improve overall performance, endurance, and compatibility of solid-state drives.
This helps improve overall performance, endurance, and compatibility of solid-state drives.
As of version 2.6.33 of the Linux kernel TRIM support exits in LInux flavors built upon this; Ubuntu 10.10 and later. There are two ways to perform/enable TRIM under Ubuntu linux -- manual vs. automatic.
Manual TRIM:In Ubuntu, enabling manual TRIM can be performed using the fstrim module in a terminal session.
sudo fstrim /
This, however, is not needed if automatic TRIM is currently enabled. Ubuntu 11.04 and earlier releases are not packaged with the fstrim module.
wiper.sh must be used and is supplied by hdparm
in /usr/share/doc/hdparm/contrib/wiper.sh.gz
.
Automatic TRIM:
Automatic TRIM has been supported since Ubuntu 10.10 (kernel 2.6.33) with the EXT4 file system. To enable automatic TRIM on a drive or partition, it needs to be mounted with the
discard
option in fstab
. Firstly, backup your fstab
, then open it for editing:sudo cp /etc/fstab ~ /fstab-backup
gksudo gedit /etc/fstab
Add discard to the
fstab
options entry(comma separated) for the SSD drive or each partition.UUID=000000000-0000-0000-0000-0000000000 / ext4 discard,errors=remount-ro 0 1
Close and save
fstab
, then reboot and automatic TRIM should now be working.Testing Automatic TRIM:
To test if TRIM is working issue the following commands:
From the output copy the number under
cd / # Replace with SSD file system path
sudo dd if=/dev/urandom of=tempfile count=100 bs=512k oflag=directsudo hdparm --fibmap tempfile
begin_LBA
and verify the device name of your SSD:System->Administration->Disk Utility e.g. sda,sdb,sdc. . .
Run the following but replace
[ADDRESS](begin_LBA
and sdX
(SSD device name) with the details obtained in the previous step.sudo hdparm --read-sector [ADDRESS] /dev/sdX
The output should be a long string of characters for those sectors.
sudo rm tempfile
sync
Repeat the
hdparm
command from above:sudo hdparm --read-sector [ADDRESS] /dev/sdX
If you get only zeros then automatic TRIM is working. However, if after removing the file the sectors are still not empty then wait a few minutes and run the command again.
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