SSD trimming

[D. Hugh Redelmeier]

"trim" support is something added in recent years to support SSDs.

Why: It helps the SSD more efficiently pretend to be a normal hard disk.

How should we use it?

There is a "discard" mount option (for ext4 or BTRFS).  That seems to be 
overkill.

Alternatively: run fstrim on each SSD filesystem once in a while (once a 
day).

See 
<http://www.webupd8.org/2013/01/enable-trim-on-ssd-solid-state-drives.html>

I welcome a better resource (I didn't look hard).

I wonder if there is some GUI setting to turn on a crontab entry to do 
fstrim.
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