[DRBD-user] slow sync speed of 12TB over 10GE

Stefan Seifert nine at detonation.org
Mon Jan 12 16:30:03 CET 2009

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


On Monday 12 January 2009 16:21:31 Lars Ellenberg wrote:
> On Mon, Jan 12, 2009 at 03:58:17PM +0100, Lars Täuber wrote:
> >     syncer {
> >         rate             1150M;
> >     }
>
> your sync-rate is set _much_ too high.  unit is _bytes_ not bits, we are
> storage guys.  and it is meant to be a _throttle_. increasing it way
> beyond physical limits does hurt, not help.

Well, he said that the servers are connected via 10GigE, so the sync rate 
should be within physical limits, even though it's much above the practical 
limit.

But I'm curious: why does it hurt? A naive view would be that it won't help, 
but at least not hurt, since it would just not throttle anything. Or do you 
mean, that it will hurt normal operations which is quite understandable?

Regards,
Stefan
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