Hi Tory as Luca said, “for 10G you need at least 8x10K RPM SATA drives”, this means for 20 Gbit 10 HDD are definitely not enough.
Alfredo On 03 Aug 2014, at 10:15, Tory Backalbat <[email protected]> wrote: > Hi Luca, > This means that you were able to reach a writing speed of 20 Gbps on the same > controller using only 10 HDDs of 10K rpm. > Is that true? > > My calculations show that with 10 HDDs of 10K rpm, with a writing speed of > approx. 200 MB/s you can only reach 2 GB/s (~16 Gb/s), which is not enough. > > Best, > Tory > > Sent: Thursday, July 31, 2014 at 6:24 PM > From: "Luca Deri" <[email protected]> > To: [email protected] > Subject: Re: [Ntop-misc] Mac Pro and n2disk > 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 > > _______________________________________________ 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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