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20020625: LDM setup at Howard (cont.)

>From: Pavel Byles <address@hidden>
>Organization: Howard University Engineering
>Keywords: 200206241943.g5OJhXa29444 LDM ldmd.conf

Pavel,

Jeff has been busy the past couple of days, so I thought that I would
jump in.

>a couple of things this time.
>When I run the ldm I don't recieve any data.
>Below s what I have in my ldmd.conf file

>request NNEXRAD ".*" snow.nrcc.cornell.edu

>is that correct?

This looks correct.  It will request all of the NEXRAD products from
all NEXRAD stations.  I hope you realize that this is a LOT of data.
For instance, there are almost 160 NEXRADs across the US, and each
one is sending out 17 products.  How often they send the products
is a function of the weather they are observing, but the rate will
vary between 6 to 12 per hour.  When the radar is operating in clear
air mode, they send 6 of each product (except precipitation ones)
every hour; when they are operating in storm mode, they send 12
of every product per hour.  This means that if all radars were running
in storm mode you would be requesting 160x17x12 products per hour.
Only sites with the best networking can handle this kind of load.

Since I have not been involved in the conversation you have been
having with Jeff, I don't know if this is your intention or not.
Please forgive me if the information is old news...

>and in my ~ldm/etc/ldmd.conf is
>NEXRAD ^SDUS[2357]. .... 
>([0-3][0-9])([0-2][0-9])([0-6][0-9]).*/p(...)(...)
>       FILE    -close 
>data/gempak/nexrad/NIDS/\5/\4/\4_(\1:yyyy)(\1:mm)\1_\2\3
>Is that correct also?

Hopefully, the entry looks like:

NNEXRAD ^SDUS[2357]. .... ([0-3][0-9])([0-2][0-9])([0-6][0-9]).*/p(...)(...)
        FILE    -close
        data/gempak/nexrad/NIDS/\5/\4/\4_(\1:yyyy)(\1:mm)\1_\2\3

and you have made sure that tabs are used at appropriate places:

1) between the NNEXRAD and the ^SDUS
2) before FILE
3) between FILE and -close
4) before data/gempak

When adding/deleting/modifying entries in the pqact.conf file, you should
always check the validity of the file by using ldmadmin:

ldmadmin pqactcheck

If this indicates errors, you need to go back in pqact.conf and find
and fix the problem(s).

>I hope that I am doing this correctly.

Your entry may be fine.  The listing in the email was not correct, but
that may be a function of the mailer moving things around.

>Why is it that when I run pqact it does nothing. It just hangs at the 
>prompt?

pqact is not designed to be run by itself.  It is run as one of several
processes when the LDM is started.

>And when I run ldmadmin it hangs after "starting LDM server"
>but the server says that it is started.

This indicates that you have an error of some kind in ldmd.conf.
When there are no errors, you will get the "starting LDM server"
message and then you will be returned back to the Unix prompt.

>But something is wrong because it 
>doesn't get any data whatsoever.

I am sure that there is a typo in ldmd.conf.  What it is I can't say, since
I havn't seen your entire file.

>Jeff: Could you check it out for me? Thanx.

Does Jeff have a logon to your system?  If so, can you resend the information
so I can jump on and take a look?  Thanks...

Tom Yoksas