[DRBD-user] Discarding device blocks very slow

Robert Altnoeder robert.altnoeder at linbit.com
Mon Jul 31 10:28:36 CEST 2017

Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.

On 07/31/2017 09:46 AM, Eric Robinson wrote:
> When I create a filesystem on an LVM logical volume on a drbd device,
> I see “Discarding device blocks.” I wouldn’t think that discards would
> be replicated, but it is going super slow. I mean SUPER slow. Discards
> normally go a 100 times faster. Are discards replicated across the
> network for some reason?
Obviously. If a block is discarded locally, the same change has to be
applied to the replica, otherwise a read from the same block on both
systems can yield different results.
> --
> Eric Robinson
Robert Altnoeder
+43 1 817 82 92 0
robert.altnoeder at linbit.com

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