[thredds] question on thredds cache

• To: "thredds@xxxxxxxxxxxxxxxx" <thredds@xxxxxxxxxxxxxxxx>
• Subject: [thredds] question on thredds cache
• From: "Pan, Jerry Yun" <pany@xxxxxxxx>
• Date: Fri, 15 Apr 2011 17:33:52 -0400

Hi,

My apologies if the following question have been asked and answered previously.

Our ORNL DAAC TDS (4.2.2, at http://thredds.daac.ornl.gov/thredds) is hosting 
some *.nc.gz netcdf files, with sizes in the range of 400-600 Mbytes (without 
decompress). We have a subsetting tool hit the server, with this issue: if the 
service URLs are not accessed for a while, the first hit to these URL will be 
very slow, and it becomes fast again after that, until the next time if server 
idles for a while (no user hits it), at which time it becomes very slow again 
for the next hit - the slow response sometime made the subsetting tool to throw 
a connection time out error.

I assume the server must be doing caching of the compressed files somehow, and 
the server does clean up the cache if a compressed file is not accessed in a 
while. If yes, is there a way to cache them longer (or perpetually)?

Thanks.
-Jerry

=======================
Jerry Yun Pan, Ph.D
ORNL DAAC
Environmental Science Division
Oak Ridge National Laboratory
Oak Ridge, TN 37831
phone: 678-770-3721