Re: F26 System Wide Change: Enable TRIM pass down to encrypted disks

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On Fri, Feb 3, 2017 at 10:18 AM, Chris Adams <linux@xxxxxxxxxxx> wrote:
> Once upon a time, Chris Murphy <lists@xxxxxxxxxxxxxxxxx> 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).

Yep. I just tested it with the default issue_discards=0 and fstrim -v
does work on an LV.

Nevertheless I don't understand the benefit of this feature if
fstrim.service is not enabled by default; nor is a discard mount
option set for the file system in fstab.


-- 
Chris Murphy
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