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drbd-user: Re: [DRBD-user] drbd questions

Re: [DRBD-user] drbd questions

From: Ben Beuchler <insyte_at_nospam>
Date: Mon Mar 01 2010 - 23:14:31 GMT
To: drbd-user@lists.linbit.com

> 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.

-Ben
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