Trim (fstrim) does not work on volumes of an encrypted LVM-group after boot
Need help. The OS is installed on a partition of an encrypted LVM group (LVM + LUKS). After booting, Trim (fstrim) does not work on any of the LVM group volumes:
What should I do to make Trim work?
However, if the same volumes are opened using "sudo cryptsetup open …", Trim works correctly!
DETAILED SEQUENCE OF MY ACTIONS:
1. Took a new SSD
2. Created and prepared LVM + LUKS partitions on it:
3. Installed OS Kubuntu 24.04.2, choosing:
sdb1 as /boot
My_group-Root as /
4. Everything installed fine, the OS boots and works fine. Trim for the partitions of the LVM group does not work.
5. I Specified the parameters in "/etc/default/grub" for Trim to work:
In "/etc/lvm/lvm.conf":
6. sudo update-grub, then reboot
7. Trim DOES NOT work
QUESTION: What should I do to make Trim work?
ADDITIONAL INFORMATION:
2.1 I boot the computer from another OS (Kubuntu 24.10)
2.2a If the same LVM group volumes are opened with "sudo cryptsetup open …", then Trim works properly:
2.2b But if the same LVM volumes are opened using KDE GUI tools (KDE Partition Manager), then Trim does NOT work:
Code:
fstrim: /media/user1/v1/: the discard operation is not supported … fstrim: /: the discard operation is not supported
However, if the same volumes are opened using "sudo cryptsetup open …", Trim works correctly!
DETAILED SEQUENCE OF MY ACTIONS:
1. Took a new SSD
2. Created and prepared LVM + LUKS partitions on it:
Code:
sdb 8:16 0 119,2G 0 disk ├─sdb1 8:17 0 1G 0 part ├─sdb2 8:18 0 48,8G 0 part │ └─luks-a254975b-86c5-4e8d-9e29-f4519e1f90d8 252:0 0 48,8G 0 crypt │ ├─My_group-Root 252:1 0 19,5G 0 lvm │ ├─My_group-v1 252:2 0 1000M 0 lvm
sdb1 as /boot
My_group-Root as /
4. Everything installed fine, the OS boots and works fine. Trim for the partitions of the LVM group does not work.
5. I Specified the parameters in "/etc/default/grub" for Trim to work:
Code:
/etc/default/grub GRUB_CMDLINE_LINUX="cryptdevice=UUID=A5265A32-048A-4DC4-8FFE-72DE69731B61:luks-a254975b-86c5-4e8d-9e29-f4519e1f90d8:allow-discards"
In "/etc/lvm/lvm.conf":
Code:
devices {
issue_discards = 1
}
6. sudo update-grub, then reboot
7. Trim DOES NOT work
QUESTION: What should I do to make Trim work?
ADDITIONAL INFORMATION:
2.1 I boot the computer from another OS (Kubuntu 24.10)
2.2a If the same LVM group volumes are opened with "sudo cryptsetup open …", then Trim works properly:
Code:
user1@computer1:~$ sudo cryptsetup open --allow-discards --persistent --type luks /dev/sdb2 luks-a254975b-86c5-4e8d-9e29-f4519e1f90d8 user1@computer1:~$ sudo fstrim -v /media/user1/v1/ /media/user1/v1/: 965,8 MiB (1012744192 bytes) trimmed
Code:
fstrim: /media/user1/v1/: the discard operation is not supported