Tony this happens as Napatech is doing something smart to collapse packets together into a single PCI transfer, so that we put less stress on the PCIe bus and thus we can avoid having two controllers and moreover a pcap file per device.
Cheers Luca On 31 Jul 2014, at 17:00, Tory Backalbat <[email protected]> wrote: > Hi Luca > Why does the Napatech card enable writing to one partition? isn't the writing > throughput still limited? > > Tory > > Sent: Thursday, July 31, 2014 at 11:18 AM > From: "Luca Deri" <[email protected]> > To: [email protected] > Subject: Re: [Ntop-misc] Mac Pro and n2disk > Tory, > we have recorders that do 20G to disk, If you use Intel NICs you need to use > 2 n2disk instances that write to 2 partitions (hence youi need two > controllers). With Napatech cards you can save everything onto the same > partition. Note that in the first case, our extraction tools merge the two > ports packets, whereas on the second case a dumped pcap is already "ready to > use". For 10G you need at least 8x10K RPM SATA drives (10 are better). > > Luca > > On 07/31/2014 09:35 AM, Tory Backalbat wrote: > Hi > > Thanks Luca for your answer, I think I'll go on the direction of a rack > mounted server. > So if I want to create a wire-rate recording server with n2disk for 2X10 > Gbps, do you think one raid controller would be enough, or should I use 2 > seperate controllers? > Is there a risk of an I/O bottleneck? > > Regards, > Tory > > Sent: Monday, July 28, 2014 at 7:30 PM > From: "Luca Deri" <[email protected]> > To: "[email protected]" <[email protected]> > Subject: Re: [Ntop-misc] Mac Pro and n2disk > Hi Tory > N2disk works on OSX but for 10g you need to use Linux. We know people who > have tried thunderbolt and the outcome is that the performance is suboptimal > (I have seen a report during the sharkfest conference) so I think OSX is not > yet a viable alternative to Linux both in performance and price > > Regards Luca > > Sent from my iPhone (sorry for typos) > > On 28/lug/2014, at 17:09, "Tory Backalbat" <[email protected]> wrote: > > Hi guys, > > I'm trying to assemble a multi-gigabit packet capture machine that is both > portable and able to capture traffic of up to 2X10 Gbps. > The requirement of portability (small and light) is essential and so the > natural choice is the mac pro with it's high performance and small size, > using a PCIe cage with thunderbolt and intel's 10 Gbps NIC. > Also - wanting to be able to capture highspeed capture I'm aiming at using > pf_ring, dna and n2disk. To do that I'll need to run ubuntu/centos natively > on the Mac pro. > > Does anyone have any experience with that kind of setup or with running > pf_ring on an apple machine? > To the ntop team- do you have experience with using pf_ring, dna on a NIC > through a thunderbolt interface? and- has pf_ring been tested on apple > devices? > Is that theortically possible? > > Thanks in advance, > Tory > _______________________________________________ > Ntop-misc mailing list > [email protected] > http://listgateway.unipi.it/mailman/listinfo/ntop-misc > _______________________________________________ Ntop-misc mailing list > [email protected] > http://listgateway.unipi.it/mailman/listinfo/ntop-misc > > > _______________________________________________ > Ntop-misc mailing list > [email protected] > http://listgateway.unipi.it/mailman/listinfo/ntop-misc > > _______________________________________________ Ntop-misc mailing list > [email protected] > http://listgateway.unipi.it/mailman/listinfo/ntop-misc > > _______________________________________________ > Ntop-misc mailing list > [email protected] > http://listgateway.unipi.it/mailman/listinfo/ntop-misc
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