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-   -   Online block discard support (aka TRIM) isn't working with kernel 3.0.4 (http://www.linuxquestions.org/questions/linux-hardware-18/online-block-discard-support-aka-trim-isnt-working-with-kernel-3-0-4-a-902218/)

TheOneKEA 09-09-2011 09:50 PM

Online block discard support (aka TRIM) isn't working with kernel 3.0.4
 
I just finished installing Debian 6.0.2.1 to my new OCZ Vertex 3 SSD and built all of my GPT partitions and ext4 filesystems in such a way to ensure that they were properly aligned to both the 4KiB pages and the 512KiB erase blocks within the SSD. I also specified the discard mount option for my SSD filesystems to ensure that online block discard support was enabled, but it doesn't appear to actually be working.

I tried the test at http://sites.google.com/site/lightru...bledandworking and confirmed that after deleting the temporary file and sync'ing all filesystems, the block discard code doesn't wipe the LBA sector of the file - I have to use the wiper.sh script to do an online manual block discard to clean up the SSD. Has anyone experienced this problem too and been able to solve it?

macemoneta 09-09-2011 10:59 PM

I doubt that takes into consideration the batched discard support.

TheOneKEA 09-10-2011 08:33 AM

Quote:

Originally Posted by macemoneta (Post 4467839)
I doubt that takes into consideration the batched discard support.

I was aware of that patch but I didn't really stop and consider the implications of it until I actually read the code. Now I think I understand why the LBAs weren't trimmed immediately.


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