[DRBD-user] slow sync speed

Yannis Milios yannis.milios at gmail.com
Wed Oct 17 12:45:38 CEST 2018

Just a quick note ..

You are correct, it shouldn't be required (v8.9.10) and I was surprised
> with that too.

In the DRBD documentation, it is stated that ...

"When multiple DRBD resources share a single replication/synchronization
network, synchronization with a fixed rate may not be an optimal approach.
So, in DRBD 8.4.0 the variable-rate synchronization was enabled by default."


"In a few, very restricted situations[4], it might make sense to just use
some fixed synchronization rate. In this case, first of all you need to
turn the dynamic sync rate controller off, by using c-plan-ahead 0;."

..by observing your configuration, it looks like you added that option
since the first time, hence no surprises here, you explicitly decided to
disable variable sync rate ... :)
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