[DRBD-user] c-min-rate priority

Ben RUBSON ben.rubson at gmail.com
Sun Apr 27 12:35:31 CEST 2014

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

> Hello,
> Let's assume the following configuration :
> disk {
>     c-plan-ahead 0;
>     resync-rate 680M;
>     c-min-rate 400M;
> }
> Both nodes are uptodate, and on the primary, I have a test IO burst running, using dd.
> I then cut replication link for a few minutes so that secondary node will be several GB behind primary node.
> I then re-enable replication link.
> What I expect here according to the configuration is that secondary node will fetch missing GB at a 400 MB/s throughput.
> DRBD should then prefer resync IOs over application (dd here) IOs.
> However, it does not seems to work.
> dd still writes at its best throughput, meanwhile reads are made from the primary disk between 30 and 60 MB/s to complete the resync.
> Of course this is not the expected behaviour.
> Did I miss something ?

Lars, DRBD team,

May I have your point of view regarding this ?

Thank you very much for your support,


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