[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

RE: FW: LDM Unidata

Hi Jeff,

I want to thank you for all the help you have provided thus far. I now have our 
LDM server setup and I think configured. I have a few questions that I hope are 
OK to ask.

Information:
- Virtual computer running Red Hat Enterprise 5.7, 1 GB RAM, 20 GB HDD, IP: 
146.6.225.29
- LDM 6.9.8 has been installed, queue created and the services started

Here are the questions I have,
1. How is security handled to keep unwanted people from access the data or is 
that an issue?
2. Any security issues I need to be aware of to make sure the server is 
configured as it should be?
3. How do I confirm LDM auto starts when the server is rebooted?
4. Do all changes have to be made through the ldm or root user?
5. I'm getting a message from SELinux that it is in permissive mode and is 
allowing things that it would not otherwise block. For LDM to function as it 
should, what mode should the system default enforcing mode be set to or is 
permissive advisable?
6. Is there anything special I need to know about the queue before I can hand 
the server off to the research group to start their configuration?

Thank you,
Scott

Thank you,
Scott


-----Original Message-----
From: Jeff Weber [mailto:address@hidden] 
Sent: Monday, August 29, 2011 1:35 PM
To: Hammock, Scott
Subject: Re: FW: LDM Unidata

Hi Scott,

Ben hit it on the head, it --depends-- on what you are planning on doing
:)

We suggest that you have enough RAM so that your queue can live in RAM space. 
Now, depending on how long you desire the data to live in your queue, we can 
evaluate RAM space. I would encourage to get no less than 2GB of RAM, and 
suggest 10-15 GB of RAM. Not knowing if CUAHSI wants to archive, or for how 
long it is desirable to be on disc, the storage volume is even more nebulous.

i.e. NEX2 ~3GB/hour, NEX3, ~1GB/hour, obs +sat+grids 1-2GB/hour, so 5-7GB of 
RAM will allow data to  live for about an hour in yuor queue.


Here are some volumes:

Feed                           Average             Maximum     Products
                     (M byte/hour)            (M byte/hour)   number/hour
CONDUIT                3294.127    [ 36.982%]     9209.677    83840.977
NEXRAD2                2867.231    [ 32.190%]     3717.636    62905.341
NEXRAD3                1006.674    [ 11.302%]     1467.467    51560.932
NGRID                   797.673    [  8.955%]     1663.490    16701.545
FNMOC                   293.180    [  3.291%]     1826.717     2539.455
HDS                     273.803    [  3.074%]      502.401    19149.409
NIMAGE                  180.327    [  2.024%]      344.132      205.818
FNEXRAD                  97.280    [  1.092%]      119.409       70.523
IDS|DDPLUS               43.162    [  0.485%]       55.504    34630.545
UNIWISC                  22.092    [  0.248%]       35.134       25.864
EXP                      18.452    [  0.207%]      232.695      138.614
LIGHTNING                 4.690    [  0.053%]        6.936      347.773
GEM                       3.728    [  0.042%]       30.579      349.114
DIFAX                     3.552    [  0.040%]       12.382        4.932
FSL2                      1.368    [  0.015%]        1.539       22.227

I would guess that CUAHSI will desire all the radars (both level2 and
level3) some model output, surface obs(IDS|DDPLUS), maybe sat imagery???
(NIMAGE and/or UNIWISC).

PLease let us know if you have any more questions, we are here.

Jeff
---------------------------------------------------------------------
Jeff Weber                                    address@hidden        :
Unidata Program Center                        PH:303-497-8676        :
University Corp for Atmospheric Research      3300 Mitchell Ln       :
http://www.unidata.ucar.edu/staff/jweber      Boulder,Co 80307-3000  :
---------------------------------------------------------------------

On Sun, 28 Aug 2011, Ben Domenico wrote:

> Hi Scott,
>
> I'm at a conference out of town right now, but I would forward your 
> note to the experts in any case, Steve Emmerson and Jeff Weber.
>
> The quick answer to your question about disk space is that it depends 
> entirely on how much data you wish to capture locally and in what 
> form.  If you were to subscribe to all data from all streams, it amounts to a 
> couple
> GB per hour.   I'll let Jeff and Steve follow up with the limits at the
> other end, i.e., the minimum configuration.   It helps to have lots of
> memory since the queue is kept in memory.
>
> It's great to hear that you are interested again.   We tried this a few
> years ago at the SDSC CUAHSI site and I don't think anything ever came 
> of it.
>
> Good luck and please let me know how it goes.
>
> -- Ben
>
> On Fri, Aug 26, 2011 at 7:45 AM, Hammock, Scott <address@hidden>wrote:
>
> >  Hi Ben,****
> >
> > ** **
> >
> > I provide I/T support for Dr. David Maidment at The University of 
> > Texas at Austin. He is wanting to get an LDM server setup for the 
> > research he is doing. Can you direct me to where I can get 
> > information about what is needed to get an LDM server setup and 
> > configured? I have the site 
> > http://www.unidata.ucar.edu/software/ldm/ldm-current/basics/platform
> > .html, but it leaves a few questions in my mind. The main question I 
> > need to get the initial setup of the server is the amount of disk 
> > space that will be
> > required.****
> >
> > ** **
> >
> > Thank you,****
> >
> > Scott Hammock****
> >
> > ** **
> >
> > Information Technology Coordinator II****
> >
> > Information Technology Group - Dean's Staff University of Texas - 
> > Cockrell School of Engineering
> > 1 University Station Stop C2100
> > Austin, TX 78712****
> >
> > address@hidden****
> >
> > www.engr.utexas.edu/itg****
> >
> > ** **
> >
> > *From:* Fernando Salas [mailto:address@hidden]
> > *Sent:* Friday, August 19, 2011 3:25 PM
> > *To:* Hammock, Scott
> > *Subject:* Re: LDM Unidata****
> >
> > ** **
> >
> > Hi Scott,****
> >
> > ** **
> >
> > I think Ben Dominico at Unidata can point you in the right 
> > direction. Below is his email:****
> >
> > ** **
> >
> > address@hidden****
> >
> > ** **
> >
> > Fernando****
> >
> > On Fri, Aug 19, 2011 at 2:53 PM, Hammock, Scott < 
> > address@hidden> wrote:****
> >
> > Hi Fernando,****
> >
> >  ****
> >
> > Do you have a contact that would be able to give me the specs on 
> > what is needed to get the LDM setup and configured?****
> >
> >  ****
> >
> > Thank you,****
> >
> > Scott****
> >
> >  ****
> >
> >
> >
> > ****
> >
> > ** **
> >
> > --
> > Center for Research in Water Resources Environmental and Water 
> > Resources Engineering The University of Texas at Austin
> > (970) 218-1556****
> >
>