I tried to enable trim on an encrypted partition, following instructions here, which isn't exactly for F17:
http://worldsmostsecret.blogspot.com/2012/04/how-to-activate-trim-on-luks-encrypted.html
and the discussion here:
http://forums.fedoraforum.org/showthread.php?t=278455
It didn't work for me. Neither "dmsetup table ... --showkeys" nor "cryptsetup status ..." indicated that trim was actually being used.
It turned out that in /etc/crypttab, for some reason, the option to specify is not discard, but allow-discards. Why?
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