[DRBD-user] Discarding device blocks very slow

Eric Robinson eric.robinson at psmnv.com
Mon Jul 31 09:46:28 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.

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?

ha11a:/dev # mkfs.ext4 /dev/vg_on_drbd0/lv_on_drbd0
mke2fs 1.42.11 (09-Jul-2014)
Discarding device blocks:   3149824/322122752

Eric Robinson

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