Hi Guilherme,
re:
> after another power failure last saturday at NCE - UFRJ's datacenter -, solon
> went offline and did not return. Apparently the HDs are taking a long time to
> be checked (if they're being checked at all), something that I'll be
> monitoring closer...
Hmm... this does not sound good.
> After its (forced) return today, the following message appeared on it's log
> several times:
>
> Apr 03 16:27:14 solon pqact[595] WARN: write(7,,512) to pipe took 2.127325 s
>
> Is this warning related with fragmented/problematic hard drive, or is it due
> to a network delay?
This kind of warning in the ~ldm/etc/ldmd.log file indicates that it is taking
a long time to process data out of the LDM queue. This can occur on heavily
loaded systems where there is alot of I/O, or on systems where there is some
problem writing to disk. It sounds like you might have the latter problem:
slow writes to disk. What does top, vmstat, or iostat say about disk I/O?
> Also the folks at Brazil's Navy (DHN) complained that they're not receiving
> data from us. The connection was refused by LDM, but there's an allow entry
> for the entire network at DHN:
>
> allow ANY ^200\.244\.76\.*$
What does the log file say about connections being refused?
> I've added individual lines for each host, but it should be working for the
> entire scope, right?
Correct. The possible reasons for the connection being refused are:
- allows do not include the machine making the request
- datastream being requested is not allowed for the downstream (a refusal for
one datastream does NOT imply refusal for all datastreams, however)
- a firewall is preventing the request by the downstream from reaching the
upstream
> By the way, I'll be presenting a paper about the IDD-Brazil at "The 8th
> International Conference on Southern Hemisphere Meteorology and Oceanography"
> this month (April 28th), as I've said before. I'm sending the extended
> abstract to you - I wanted to send it before the submission deadline, but I've
> finished it in the last moment (again :) ). The general idea is to introduce
> the IDD network and the Unidata softwares to the attendees - since it's an
> oral presentation it will be much more interesting :-)
Excellent!
> As a side note, I was very pleased to see that USP, UFPA, CPTEC and
> Universidad de Buenos Aires have accepted abstracts for the AGU Assembly. It
> should be a great opportunity to share some ideas and set the IDD-Brazil in
> perspective (_if_ everyone manages to go!).
I agree completely. I will be sending you a separate (good) email about your
request for travel assistance.
Cheers,
Tom
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Ticket Details
==================
Ticket ID: XSZ-617864
Department: Support IDD Brasil
Priority: Normal
Status: Closed
