On Tue, Nov 29, 2016 at 3:09 PM, Andreas Klauer <Andreas.Klauer@xxxxxxxxxxxxxx> wrote: > On Tue, Nov 29, 2016 at 01:20:16PM -0700, Chris Murphy wrote: >> Seen /etc/lvm/lvm.conf issue_discards is probably set to 0. > > It should be 0 unless you understand what it's doing and actually want it... > > Don't confuse LVM's issue_discards with cryptsetup's allow_discards. Reading the documentation for both, they're functionally the same thing in that with these options the particular layer will pass on a trim to the next layer underneath it. So if the idea is to get trim to to the SSD as the original poster suggests they want, then they'd have to use the option at every logical device. Of course there are good reasons to support trim affecting one or more layers, but not pass it onto the physical block device. -- Chris Murphy -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
