[Beowulf] Re: question for licensed software users

Peter St. John peter.st.john at gmail.com
Wed Jun 27 07:53:41 PDT 2007


Can you use a competititor of Flexlm, such as IBM's LUM, or is Flexlm
required by Maple? If the later, I'd complain to Maple.
It's sad to me that there are folks who need proprietary UIs to do science,
while there are businesses paying C programmers to bucket-brigade cruft that
should be handled by pretty, and expensive, (N+1)GL packages with ribbons
tied around them. C'est la vie.
Peter


On 6/26/07, Andrew Robbie <andrew.robbie at gmail.com> wrote:
>
>
> On 26/06/2007, at 2:57 AM, Daniel Pfenniger wrote:
>
> > Hi,
> >
> > I encountered also a NIC problem with Maple flexlm.  Flexlm checks
> > the existence of the original eth0 NIC present at Maple install time.
> > This interface was later bad, so a second one was added and
> > used instead of eth0.  But then Maple was then prevented to start by
> > flexlm.  After some search it was found that after each reboot one has
> > to initialize eth0 once (ifconfig eth0 ... up), even if disabled later
> > in order to satisfy flexlm.
>
> It is possible under linux (and sometimes windows depending on the
> driver) to tell a card to use a different MAC address. If you are
> throwing out a bad NIC (ie two nodes with the same MAC will never
> appear on the network) this is a possible solution. It has to be done
> at every reboot, but that is easily accomplished by creating a
> startup script (or using rc.local). man ifconfig.
>
> > No need to say that the lost time finding the cause of flexlm
> > disfunction
> > was yet another argument to hate licensed software.
>
> Talk to your vendor. The more people who complain the better.
>
> Andrew
>
>
> >
> >       Dan
> >
> >
> > David Mathog wrote:
> >>> I have had eth0 and eth1 "change" identities as I patch the OS or
> >>> add
> >>> ethernet cards.
> >>
> >> Recent versions of Linux, such as Mandriva 2007.1, have an /etc/iftab
> >> and/or /etc/udev/rules.d/61-net_config.rules files.  Both of these
> >> associate one specific MAC with eth0, eth1, etc..
> >> The original intent was noble - they were trying to provide a
> >> way to allow eth0 to always be the wired and eth1 the wireless
> >> network connection, for instance.  However if these files
> >> get the least bit out of sync with the actual hardware
> >> all hell can break loose.  For instance, if one clones a single NIC
> >> machine that uses these mechanisms the MAC won't match, eth0 won't be
> >> used and a new eth1 will be magically created.  Unfortunately
> >> the firewall doesn't know about eth1 and everything network
> >> related then breaks.  Result, most likely the machine will hang
> >> during boot.  Others have reported machines which create a new
> >> eth# device at each boot, abandoning all the previous ones.  The
> >> general
> >> fix for these sorts of bugs is to delete both of these files, and
> >> at the next boot the udev file will be recreated and will match the
> >> hardware.  I have not seen a need for /etc/iftab and just leave it
> >> deleted.
> >>
> >> Now, back to Joe's problem, for the linux machines that are having
> >> flexlm problems, if the nature of the problem is that eth0 and eth1
> >> are swapping around at random, and those distros have these
> >> mechanisms,
> >> be sure these two files exist and are configured properly so that
> >> eth0 and eth1 are rigidly mapped to fixed MAC addresses.
> >>
> >> Regards,
> >>
> >> David Mathog
> >> mathog at caltech.edu
> >> Manager, Sequence Analysis Facility, Biology Division, Caltech
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