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I currently have a little SSD (32 GB) for / and another HDD (250 GB) for /home where I use eCryptfs to encrypt my personal files. I consider buying a big SSD (500 GB) to have all the data on a SSD as well. With the Kubuntu installer, I found the “guided with encrypted LVM” pretty satisfying, I am just not sure whether this would enable TRIM on the SSD.

This seems to pose a bit of a risk, but I assume that the performance will turn bad pretty quickly if I do not use TRIM.

  1. Does the installer automatically enable TRIM?
  2. If not, how could I enable it after the installation?
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Martin Ueding
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1 Answers1

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Will “guided with encrypted LVM” enable TRIM on a SSD?

No. Trim is installed by the installer though but the 2 have no correlation. Trim is enabled based on the brand of your SSD. If the SSD is supported and tested prior and deemded working perfectly trim will be enabled. Otherwise it will be installed and disabled and you need to enable it manually. This is independent of the installer.

So one installation might have you a working trim from the start; another installation might have you needing to enable it manually.

If not, how could I enable it after the installation?

From fstrim:

5555            if ! contains "$HDPARM" "Intel" && \
5656               ! contains "$HDPARM" "INTEL" && \
5757               ! contains "$HDPARM" "Samsung" && \
58                ! contains "$HDPARM" "SAMSUNG"; then
59                 echo "device $DEV is not an Intel or Samsung drive"
 58               ! contains "$HDPARM" "SAMSUNG" && \
 59               ! contains "$HDPARM" "OCZ" && \
 60               ! contains "$HDPARM" "SanDisk" && \
 61               ! contains "$HDPARM" "Patriot"; then
 62                echo "device $DEV is not a drive that is known-safe for trimming"
6063                continue
6164            fi
6265        fi

How is Trim enabled?

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Rinzwind
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