It turns out to be a caching issue.
When a region of the SSD is trimmed, that data is lost. However for some
unfathomable reason, Linux keeps the data in its caches. As a result,
the 2nd dd call returns wrong data, making it seem as if the TRIM didn't
work regardless whether it really did or not.
Any progress on this issue?
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https://bugs.launchpad.net/bugs/1213631
Title:
Trim doesn't work with lvm and dm-crypt
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Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: lvm2 (Ubuntu)
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/1213631
Title:
Trim
