[DRBD-user] four bonded gigabit NICs

Bart Coninckx bart.coninckx at telenet.be
Thu May 13 17:53:33 CEST 2010

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


On Thursday 13 May 2010 17:09:24 Michael Schwartzkopff wrote:
> Am Donnerstag, 13. Mai 2010 17:01:46 schrieb Bart Coninckx:
> > Hi,
> >
> > would it make sense to use four bonded gigabit NICs when the DRBD storage
> > is, let's say, a RAID 5 on 10K RPM SAS drives? Or would 2 cards be
> > sufficient? I don't have the drives and the controller yet, so I have no
> > idea on what their performance is.
> >
> > I'd like to order all hardwa of the dre at once, but it is hard to get a
> 
> grip on
> 
> > possible performance values.
> >
> > Anyone any "feel" for this?
> 
> the answer to this question mainly depends on the performance of your
>  drives. In any case I'd advise to use at least a boding of two interfaces.
>  So you have redundancy if one line fails.
> 
> From your measurements (netperf) we know that you get nearly 2 GB/s over
>  this line with the right bonding mode.
> 
> The rest really depends on the performance of your drives and what you want
>  to do with it. But from out measurments with bonnie we learned that the
>  performance of the drives if the bottleneck and not thethroughput of the
>  interfaces. At least not in our tests with 6 x 15k SAS drives in a RAID5
>  array and a 2 Gbit bond.
> 
> Greetings,
> 

Mmm, we plan to use just 10K drives and not even that many in one RAID 5. So 
no way the NICs are going to be saturated I guess.

Thx!


Bart



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