Once upon a time, Chris Murphy <li...@colorremedies.com> said:
> Further I wonder if /etc/lvm/lvm.conf needs
> issue_discards = 1
> 
> Both / and /home are actually LV's which are made from the LUKS PV. So
> trim pass down from dmcrypt to block device isn't enough to do
> anything.

LVM passes discards through automatically, assuming the block device
under the PV supports them.  The issue_discards option tells LVM to
issue discards itself when PV space is released (e.g. an LV is
removed/reduced).

I'm not sure why issue_discards=1 is not the default, but that's a
separate issue from this change.
-- 
Chris Adams <li...@cmadams.net>
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