RE: LDM Archive Machine

I wasn't necessarily trying to sway people, just pointing out alternatives.
Of course our Solaris Intel box is going is going on 2 1/2 years with no LDM
or decoder associated crashes.  Maybe there is a secret bullet for making
Linux
work well with the LDM.  I am sure people would be interested.  A perusal
of the support-archives certainly shows the need for that.  BTW Linux
also does not work properly with certain portions of the McIDAS ADDE
server..
another reason to at least consider Solaris.

I have done this before here..I am just doing what Sun should have done
all along..point out a great OS.  I am thankful Unidata pointed me in
that direction nearly 3 years ago.

Robert

-----Original Message-----
Sent: Tuesday, September 18, 2001 3:14 PM
Cc: akrherz@xxxxxxxxxxx; ldm-users@xxxxxxxxxxxxxxxx;
owner-ldm-users@xxxxxxxxxxxxxxxx



Bob,

Everyone has there favorite OS, so I won't try and convince folks that one
is better than another. But
I can say without a doubt that LDM in the linux environment can be very
stable.  I manage about 6 machines
that are running Linux Mandrake 7.1 (Red Hat core) with LDM, and they run
months at a time without any problems.

I am sure with the variations of the distributions of Linux and different
kernels that there are some
issues, but LDM runs flawlessly on our setup. If anyone is interested I can
send you the configurations that
we have had much success with.

Mike Dross
Duke Energy



 

                    Robert Mullenax

                    <rmullenax@xxxxxxxxxxx        To:     "'Daryl Herzmann'"
<akrherz@xxxxxxxxxxx>,                          
                    m>                            ldm-users@xxxxxxxxxxxxxxxx

                    Sent by:                      cc:

                    owner-ldm-users@unidat        bcc:

                    a.ucar.edu                    Subject:     RE: LDM
Archive Machine                                       
 

 

                    09/18/01 03:33 PM

 

 





Daryl,

I wish you luck in your endeavor, but IMO, and based on my tests and
observing the e-mails about LDM through the years, the problems with
LDM crashing/kernel problems..etc is due to Linux itself.  It certainly
has the well known problem of crashing under heavy load, whereas
Solaris Intel is virtually bulletproof.  Not to pick on Gilbert,
he's been a great help to me over the years, but his LDM just crashed
again..he hates Solaris but I am 99.9% sure these bouts he has would
go away if he'd switch.  At my previous job at NMSU/NSBF we have been
running
 the LDM plus all of the GEMPAK AND McIDAS decoders plus a web server and
GARP/McIDAS sessions on a single CPU Gateway PC running Solaris for over
two
years now.  The
only problems that have ever occurred were related to hung gplt routines
caused by my CGI scripts.  These occasional to frequent crashes that
LDM-Linux
boxes all seem to have simply don't occur or rarely occur with Solaris
Intel.
Performance is fine as well..and as CPU usage approaches 100% you'll see
Solaris
surpass Linux.

Anne can correct me on this but Unidata is running an incredible amount of
stuff on their dual PIII Solaris machines and have never had a problem.

Linux has it's place, but with this particular application (the
LDM/decoders)
it simply fails more often than it should.  If you continue to have
problems
I would suggest that you at least look into Solaris x86.  Solaris will run
on the Athlon, depending on the particular motherboard.  We had a network
problem at NMSU/NSBF which caused us always to lose a bunch of data.  I
eventually
arranged for our feed to set his ldm to 5400 seconds as I did mine to cut
down on that a bit..then when I needed data I put out a call on this e-mail
list or the needdata list.  There are many people archiving out there.

In any event, good luck, to you.

 /**
  * Daryl Herzmann (akrherz@xxxxxxxxxxx)
  * Program Assistant -- Iowa Environmental Mesonet
  * http://mesonet.agron.iastate.edu
  */