Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
On Fri, Jul 21, 2017 at 06:21:15PM +0000, Eric Robinson wrote: >Folks, does anyone know why trim does not show as enabled for drbd? > >The physical drives support it. The raid array supports it. I can trim non-drbd volumes just fine. But the drbd devices show trim as not supported. > ># lsblk -D >NAME DISC-ALN DISC-GRAN DISC-MAX DISC-ZERO >sda 0 512B 4G 1 >├─sda1 0 512B 4G 1 >│ └─md0 0 128K 256M 0 >├─sda2 0 512B 4G 1 >│ └─md1 0 128K 256M 0 >├─sda3 0 512B 4G 1 >├─sda4 0 512B 4G 1 >├─sda5 0 512B 4G 1 >│ └─md2 0 128K 256M 0 >│ └─drbd0 0 0B 0B 0 <-- Note: DISC-GRAN and DISC-MAX should be non-zero. > >I'm using drbd 9.0.1. For DRBD 9, we will pretty much ignore any complaints against anything older than "latest", which currently is 9.0.8. The up-merge of the write-same and discard support from 8 to 9 was unfortunately broken in many ways. It has just received yet an other fix (unrelated to your scenario, related to the request size verification) even post 9.0.8. So yes, it *will* help. And no, you will not have any luck with 9.0.1. Not at all. And not only for discards. -- : Lars Ellenberg : LINBIT | Keeping the Digital World Running : DRBD -- Heartbeat -- Corosync -- Pacemaker DRBD® and LINBIT® are registered trademarks of LINBIT __ please don't Cc me, but send to list -- I'm subscribed