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[LDM #QLN-586184]: Installation Machine Questions

This archive contains answers to questions sent to Unidata support through mid-2025. Note that the archive is no longer being updated. We provide the archive for reference; many of the answers presented here remain technically correct, even if somewhat outdated. For the most up-to-date information on the use of NSF Unidata software and data services, please consult the Software Documentation first.

  • Subject: [LDM #QLN-586184]: Installation Machine Questions
  • Date: Tue, 20 Aug 2013 16:05:17 -0600
Arturo,

Data-products reside in the LDM product-queue for a limited amount of time 
(typically on the order of an hour). In order to use the data-product, a 
pqact(1) process must be configured to extract them and either FILE them to a 
disk or PIPE them to an LDM decoder (which could file them to a disk or do 
something else). The size of the disk necessary to hold all the FILEed 
data-products depends on the rate at which the data-products are FILEed and how 
long you want to hold onto them. The webpage 
<http://www.unidata.ucar.edu/cgi-bin/rtstats/siteindex?emo.unidata.ucar.edu> 
can give you an idea of how much data each feed contains. Multiply the rate of 
data by how long you want to have it available to arrive at a minimum disk size.

> I attended the last LDM training with you last August. We are getting ready 
> to order our machine for installation of LDM and TDS.I am still a little 
> confused about the difference of the LDM queue size requirements VS permanent 
> storage of data once extracted from queue. We can set the size limit of the 
> queue which resides on local hard drive. Can the data extracted from the 
> queue be written local storage array to reduce the size of the local hard 
> drive? This brings me to a second question. What do you recommend for the 
> size of the local hard drive where CentOS is to be installed if we consider 
> our department a small unit and will be ingesting a limited number of feeds. 
> I know it's a difficult question to answer without specific details, but I am 
> just trying to get an idea of the hardware configuration for the server we 
> need to order based on your experience with other installations.
> Thank you very much in advance for your assistance.
> 
> P       Please consider the environment before printing this email.
> 
> 
> [cid:tamiu-banner.jpg@5686e392e0e54868a019423dd2a15efa]
> 
> ________________________________
> [cid:poweredbytamiu.png@892dde8c82ee484aa10cbcffd3bb9cda]
> 
> Arturo  Diaz, Jr.
> Programmer I (CEES)
> Biology and Chemistry
> LBVSC 346
> Laredo, TX 78041
> Tel. (956) 326-2415
> Fax (956) 326-3125

Regards,
Steve Emmerson

Ticket Details
===================
Ticket ID: QLN-586184
Department: Support LDM
Priority: Normal
Status: Closed