I appreciate its the pci bus thats the ultimate limit. You could have multiple
network devices using channel bonding to max out the pci bus, in the same way
as having multiple scsi controllers
I think the main purpose of distibuted filesystems is making better use of
existing technology rather than creating one superdooper machine.
As far as expense goes, scsi is about 50% more expensive than ide technology.
In reality distributed filesystems can be really cheap if implemented ontop of
existing infrastructure, say you have a lan of 20 existing desktop pc's that
came with 6GB drives if you spare a gig or so from each drive, then the only
expense is getting better network technolgy cards and a switched hub.
Aaron Lehmann wrote:
> Lets say you are using gigabit ethernet and a dozen machiens with IDE
> disks. You should not be comparing gigabit ethernet with the SCSI, because
> the local interface is really the PCI bus, which is capable of gigabits
> AFAIK. You can put 6 ultra-wide-scsi3 controllers in a machine and
> accomplish the same effect as putting one 80mb/sec controller in each of 6
> machines and putting them on a gigabit lan. on asingle machine, you lose
> the bottleneck (and expense!) of the networok.
>
> Note that you can also put many IDE controllers in one machine and RAID
> the disks.
>
> On Sun, 21 Mar 1999, Glenn.McGrath wrote:
>
> > Hi people, disclamer first, im new to this list and have a lot to learn
> > on kernels and distributed filsystems(DFS).
> >
> > The way i see it network technology is developing at a much faster rate
> > than local media, currently. (bleeding edge technolgy) gigabit ethernet
> > (120MB/s), is faster than ulta-wide-scsi2 (80MB/s max), so getting data
> > simultaneously from a dozen servers (ide drives or whatever) on a
> > switched Gbit network is fastest way to get data into your comp.
> > Comparisons can be made with different technology, but im sure you get
> > the point.
> >
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.rutgers.edu
Please read the FAQ at http://www.tux.org/lkml/