Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
For what it's worth: 1. Discard is enabled and working on both nodes. 2. No messages about trim or discard in the logs. 3. Network latency is sub-1 millisecond, bandwidth is 1 Gbit (utilization about 10%). 4. Drbd is version 9.0.8 on both nodes. -- Eric Robinson > -----Original Message----- > From: drbd-user-bounces at lists.linbit.com [mailto:drbd-user- > bounces at lists.linbit.com] On Behalf Of Robert Altnoeder > Sent: Monday, July 31, 2017 2:17 AM > To: drbd-user at lists.linbit.com > Subject: Re: [DRBD-user] Discarding device blocks very slow > > On 07/31/2017 10:46 AM, Eric Robinson wrote: > > But that still does not explain why discards across the network are so slow. > > There are lots of possible reasons. > Discard might not be enabled on both nodes, there should be a message > about discard being available or unavailable in the logs. IIRC, if it can't discard, > it will zero-out. > The network may have too high latency or too low bandwidth. > Without a great amount of detailed information all one can do about > performance-related issues is to guess. > > Generally, both nodes should be running the same and most recent version > of DRBD 9, because all those features have been added quite recently, and > lots of enhancements and fixes are still applied to the code. > > -- > Robert Altnoeder > +43 1 817 82 92 0 > robert.altnoeder at linbit.com > > LINBIT | Keeping The Digital World Running DRBD - Corosync - Pacemaker f / > t / in / g+ > > DRBD(r) and LINBIT(r) are registered trademarks of LINBIT, Austria. > _______________________________________________ > drbd-user mailing list > drbd-user at lists.linbit.com > http://lists.linbit.com/mailman/listinfo/drbd-user