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drbd-user: Re: [DRBD-user] four bonded gigabit NICs

Re: [DRBD-user] four bonded gigabit NICs

From: Bart Coninckx <bart.coninckx_at_nospam>
Date: Fri May 14 2010 - 16:28:34 GMT
To: drbd-user@lists.linbit.com

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,
>

Michael,

what is the "right bonding mode" to you? Mode 0?

thx!

B.
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