On 02/03/2017 06:12 PM, Chris Murphy wrote:
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.
I think this is unrelated to this change request. The current kernel
default (in dm-crypt target!) is that it silently throws away/blocks any
discard that land on dm-crypt device. As far as I know this particular
kernel default is not going to change in any foreseeable future for
other reasons (It could destroy hidden volumes configured in legacy
TrueCrypt). With this change we just *allow* the discard to pass through
dm-crypt target. Whether other components in Fedora generate the discard
request itself is imo of the scope for this change request.
(lvm.conf issue_discards = 1 explained Zdenek in other post)
O.
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