[SSD Users] Activating TRIM

[Swed 2651]

"In computing, a TRIM command allows an operating system to inform a solid-state drive (SSD) which blocks of data are no longer considered in use and can be wiped internally. Although TRIM is frequently spelled in capital letters, it is a command name, not an acronym"

"Without the command, your operating system knows when data is deleted, but has no way to tell the SSD's controller. In turn, the SSD keeps moving that information around via garbage collection, unnecessarily programming and erasing the flash memory cells with stale data. This means that, at some point, the SSD will fill up with data, leaving the controller only with over-provisioned flash with which to work. That's seven to 12% of most desktop SSDs, and includes the space for firmware features like bad block replacement."

Pretty much it increases the lifespan and durability of your SSD

How to Activate:

 

1. Open a command prompt

 

2. Type: " fsutil behavior query DisableDeleteNotify"

3a. If you get 0 as a response, TRIM is on and you have nothing to do after this

 

3b. If you get 1 as a response, TRIM isn't activated

 

4. To activate TRIM, input: "fsutil behavior set DisableDeleteNotify 0"

 

5. Repeat Step 2

 

Edited August 10, 2013 by Swedish House Mafia

[driz 2626]

what if you use a good operating system?

[Lesbian Dad 555]

what if you use a good operating system?

 

this can matter too and the format (FAT/32, NTFS etc.) as well.

[BLiNDBoi 930]

From what I know of SSDs that they have given number of writes it can do before media wear occurs to the point of data loss. Wouldn't this command just force a 'blank' write onto the SSD which would only further the wear on the device? I know the SSD controller should be spreading/allocating space out randomly to reduce media wear. I know if your using a SSD on a windows XP for example you should turn off disk defrag for them and because it gives zero performance boost.

Edited August 10, 2013 by BLiNDBoi

[Dojima 7619]

what if you use a good operating system?

Then just follow these instructions:

 

1. Open a command prompt

 

2. Type: " fsutil behavior query DisableDeleteNotify"

3a. If you get 0 as a response, TRIM is on and you have nothing to do after this

 

3b. If you get 1 as a response, TRIM isn't activated

 

4. To activate TRIM, input: "fsutil behavior set DisableDeleteNotify 0"

 

5. Repeat Step 2

[driz 2626]

In good operating systems you have ways depending on your setup

 

using lvm

enable issue_discards in your lvm conf

 

for dm_crypt

add a discard option in crypttab

 

for your filesystems, dont discard in fstab, it causes a performance decrease, you should use a scheduler (like crontab) to periodically run fstrim (fstrim wont run if you dont do the above stuff when required)

 

that being said in linux this only works on filesystems that implement ioctl FITRIM which are btrfs ext3 ext4 gfs2 jfs ocfs2 xfs... amusing, as some of you saw my post on oracle, the new version of oracle no longer uses ocfs2, and ACFS doesnt support trim... 

Edited August 10, 2013 by driz