On Sep 12, 2014, at 2:24 AM, Jarkko Oranen wrote: > On Thu, 2014-09-11 at 18:31 -0500, Brassow Jonathan wrote: > >> dm-raid.c does not have that - dm-raid1.c does. dm-raid1.c is a mirroring implementation specific to device-mapper. It is used by LVM for pvmove functionality (and is otherwise being slowly phased out). dm-raid.c is the device-mapper wrapper around the MD RAID personalities. It does not have discard support. >> >> I will ask Neil what the current state of discard support is in MD. I see that "support" was added in Oct of 2012 (starting at commit 2ff8cc2), but I remember them having problems with discards + any resync operations. If Neil says it is ok, I will turn it on. >> > > In the code that I'm looking at dm-raid.c definitely sets > num_discard_bios to 1 on something... As does dm-raid1.c. However, > Thanks for looking into it! Heinz Mauelshagen is looking to get this included upstream now. Thanks for the poke! :) Initial status query: http://marc.info/?l=linux-raid&m=141047869821032&w=2 Patch posted for consideration: https://www.redhat.com/archives/dm-devel/2014-September/msg00126.html brassow _______________________________________________ linux-lvm mailing list linux-lvm@redhat.com https://www.redhat.com/mailman/listinfo/linux-lvm read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
