openSUSE Forums: How to enable TRIM on Luks-encrypted SSD on boot?

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How to enable TRIM on Luks-encrypted SSD on boot? Jan 6th 2013, 16:05 Hi, I recently bought an Intel 520 SSD on which I installed Opensuse 12.2 within an Luks-encrypted LVM container for an ext4-filesystem. My kernel (3.XX) and Cryptsetup (1.5), as well as the file-system (Ext4) support TRIM-commands through the "discard" option as I understand it; enabled through "/etc/fstab". However for TRIM to fully work, the "discard" option has to be passed onto the crypto filesystem. This can be done manually when opening the container through Code: cryptsetup luksOpen --allow-discards /dev/sda2  cr_sda2 and the successfull result verified through Code: dmsetup table /dev/mapper/cr_sda2 --showkeys . However adding either "discard" or "allow-discards" to my "/etc/crypttab"does not have any effect after reboot, despite rebuilding the boot-environment with "mkinitrd". Code: cr_sda2 /dev/sda2 none luks,discard,allow-discards Btw I'm using a boot partition for grub2 etc. (sda1). What have I done wrong? Any ideas on how to make this work on boot?

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