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Current linux kernel version supports trim however Debian Squeeze uses an old version that does not.

As I understand, the trim support is in the linux kernel itself and not a specific filesystem. Therefore, will ext3 support trim in the new kernel? If it does not, will it support it in the future?

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All layers of the storage stack have to support trim. After all only file system layer knows, which blocks are safe to be wiped.

This post on the ext4 developers list with patch for elements of trim functionality in ext3 strongly suggest that such work is being done already.

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The fstrim command is present in Fedora 15....

Kernel version 2.6.41.4-1.fc15.x86_64.

Package: util-linux-2.19.1-1.4.fc15.x86_64.rpm

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