[DRBD-user] drbd questions

Ben Beuchler insyte at gmail.com
Tue Mar 2 00:14:31 CET 2010

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

> so played around a bit but always have low sync-performance with drbd at
> 74mb what is 1/3 from the available bandwidth to the other node;
> whatever i set with the parameters i will not get more throughput;

Is that bits or bytes?  In either case, that's quite slow.  Over a
single Gb link I've been able to get around 850 megabit of throughput
on the initial sync.
(RAID 5, 10K RPM SAS disks)

> i assume that the rest of the performance is lost on latency on protocol c
> on my hardware and therefore tuning some parameters in drbd.conf will not
> take effect - is this correct?

You have a bottle-neck somewhere; I doubt it's in DRBD.  Have you
verified that your disks and / or network can achieve any more
throughput than you describe?  The DRBD docs include some basic disk
throughput tests.  iperf is great for testing network throughput.


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