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Does upgrading a kernel automatically enable trim?

rated 0 times [ 2] [ 0] / answers: 1 / hits: 1958 / 2 Years ago, wed, december 1, 2021, 1:38:40

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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oargrou

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answered 2 Years ago kroapathe · Accepted Answer

No, upgrading a kernel does not turn it on automatically - it's still off by default for the kernel shipped with 12.04.

Please refer to the manpage of mount:

discard/nodiscard

  Controls whether ext4 should issue discard/TRIM commands to  the

  underlying  block  device when blocks are freed.  This is useful

  for SSD devices and sparse/thinly-provisioned LUNs,  but  it  is |

  off by default until sufficient testing has been done.           | <--