Does upgrading a kernel automatically enable trim?

Posted by Sheldon Ross on Ask Ubuntu See other posts from Ask Ubuntu or by Sheldon Ross
Published on 2012-09-18T21:16:12Z Indexed on 2012/09/18 21:52 UTC
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12.04

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10.04

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upgrade

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trim

Simple question, I have some servers that were running 10.04 that I upgraded to 12.04.

So they were installed using 10.04 (kernel 2.6.32* I believe) and the version of ext4 that shipped then.

By upgrading to 12.04 and the newer kernel, does that enable TRIM automatically? (Do I need to add 'discard' to the fstab?) Or do I need to do a clean install of 12.04 to get TRIM functionality on those drives.

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