Ubuntu – Does upgrading a kernel automatically enable trim

kerneltrim

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.

Best 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.           | <--

Dependencies

As for dependencies: Software Center / dpkg will tell you if any dependencies are not met. Worst case is, you'll have to download them all manually and install them. If we're talking about just one or two packages, I'd do so.

I have not much experience about auto-installing dependencies. You can try one of the following and see if it works:

Warning: Stuff gets increasingly riskier further down the list!

dpkg -i PACKAGENAME.deb then apt-get -f install. The former installs the package no matter what, the latter fixes broken dependencies.
Try to install it with gdebi
See if this howto helps

You could try the daly build kerne-ppa:

apt-add repository ppa:kernel-ppa/ppa
apt-get update
apt-get install PACKAGENAME

Enable natty repositories in synaptic for a short while (do not run update-manager, while enabled).

Sorry, I can't be of more help. When I tried it back in the days, I just had to install the one package. Maybe this also helps: How do I add the kernel PPA?

Ubuntu – Nvidia drivers don’t work with mainline kernel

(answering my own question, as Bruno suggested in comments)

This problem is fixed by installing the Nvidia-provided drivers by hand, following the below steps.

Download the drivers from the Nvidia website
Reboot into recovery mode as the drivers won't install with X running. Do this by rebooting, holding shift if necessary to get into Grub and choosing the recovery option, then "Root shell" at the text menu.
You should now be faced with a shell that looks something like this:
```
root@sirius:~# 
```
Enter the following command so that the root filesystem is writable:
```
mount -o rw,remount /
```
Install a few required packages (you may need to do dhclient eth0 to bring the network up beforehand):
```
apt-get install dkms
```
Make the Nvidia installer executable and run it:
```
chmod +x $INSTALLER_FILE
./$INSTALLER_FILE
```
where $INSTALLER_FILE is the location where the installer is downloaded to (use tab-completion to help you, probably something like /home/josh/Downloads/NVIDIA-Linux-x86_64-302.17.run)
Work through the steps in the installer. The defaults should work.
Reboot into a normal system.

Best Answer

Related Solutions

Ubuntu – What’s the best way to update the linux kernel if I have no internet connection

Dependencies

Ubuntu – Nvidia drivers don’t work with mainline kernel

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