[Go-essp-tech] repeated md5 chksum failures

Wed Apr 11 12:51:52 MDT 2012

Hi, Everyone -- 
I'm trying to download some fairly large files (~1Gb) from the piControl run (monthly ocean variables) and find that the checksum fails to match several times and then will be ok. In some cases, it can take 10 or more re-tries before the checksum succeeds. 

The problem is not with a specific data node. Here are some of the dataset IDs for the troublesome downloads: 
cmip5.output1.CCCma.CanESM2.piControl.mon.ocean.Omon.r1i1p1.v20111028
cmip5.output1.INM.inmcm4.piControl.mon.ocean.Omon.r1i1p1.v20110323
cmip5.output1.MIROC.MIROC-ESM.piControl.mon.ocean.Omon.r1i1p1.v20110929
cmip5.output1.MRI.MRI-CGCM3.piControl.mon.ocean.Omon.r1i1p1.v20110831
cmip5.output1.NCAR.CCSM4.piControl.mon.ocean.Omon.r1i1p1.v20120220
cmip5.output1.NCC.NorESM1-M.piControl.mon.ocean.Omon.r1i1p1.v20110901
cmip5.output2.MRI.MRI-CGCM3.piControl.mon.ocean.Omon.r1i1p1.v20110831
cmip5.output2.NCC.NorESM1-M.piControl.mon.ocean.Omon.r1i1p1.v20110901
cmip5.output1.MPI-M.MPI-ESM-LR.piControl.mon.ocean.Omon.r1i1p1.v20120315
cmip5.output1.MPI-M.MPI-ESM-P.piControl.mon.ocean.Omon.r1i1p1.v20120315
cmip5.output2.MPI-M.MPI-ESM-P.piControl.mon.ocean.Omon.r1i1p1.v20111028

For example, from the final two datasets in the list, here is an entry from the wget script:
'rhopoto_Omon_MPI-ESM-P_piControl_r1i1p1_185001-185912.nc' 'http://bmbf-ipcc-ar5.dkrz.de/thredds/fileServer/cmip5/output2/MPI-M/MPI-ESM-P/piControl/mon/ocean/Omon/r1i1p1/v20111028/rhopoto/rhopoto_Omon_MPI-ESM-P_piControl_r1i1p1_185001-185912.nc' 'MD5' '036aabfc10caa76a8943f967bc10ad4d'

Here are the 21 download tries so far today, taking 5 hours, the "md5 failed!" message appears in the log file after each one: 
2012-04-11 09:19:18 (2.19 MB/s) - `rhopoto_Omon_MPI-ESM-P_piControl_r1i1p1_185001-185912.nc' saved [1083611268/1083611268]
2012-04-11 09:35:05 (1.13 MB/s) - `rhopoto_Omon_MPI-ESM-P_piControl_r1i1p1_185001-185912.nc' saved [1083611268/1083611268]
2012-04-11 09:53:26 (1009 KB/s) - `rhopoto_Omon_MPI-ESM-P_piControl_r1i1p1_185001-185912.nc' saved [1083611268/1083611268]
2012-04-11 10:05:52 (1.49 MB/s) - `rhopoto_Omon_MPI-ESM-P_piControl_r1i1p1_185001-185912.nc' saved [1083611268/1083611268]
2012-04-11 10:17:03 (1.61 MB/s) - `rhopoto_Omon_MPI-ESM-P_piControl_r1i1p1_185001-185912.nc' saved [1083611268/1083611268]
2012-04-11 10:31:14 (1.30 MB/s) - `rhopoto_Omon_MPI-ESM-P_piControl_r1i1p1_185001-185912.nc' saved [1083611268/1083611268]
2012-04-11 10:48:50 (1.04 MB/s) - `rhopoto_Omon_MPI-ESM-P_piControl_r1i1p1_185001-185912.nc' saved [1083611268/1083611268]
2012-04-11 11:01:09 (1.46 MB/s) - `rhopoto_Omon_MPI-ESM-P_piControl_r1i1p1_185001-185912.nc' saved [1083611268/1083611268]
2012-04-11 11:14:01 (1.40 MB/s) - `rhopoto_Omon_MPI-ESM-P_piControl_r1i1p1_185001-185912.nc' saved [1083611268/1083611268]
2012-04-11 11:29:46 (1.15 MB/s) - `rhopoto_Omon_MPI-ESM-P_piControl_r1i1p1_185001-185912.nc' saved [1083611268/1083611268]
2012-04-11 11:42:39 (1.40 MB/s) - `rhopoto_Omon_MPI-ESM-P_piControl_r1i1p1_185001-185912.nc' saved [1083611268/1083611268]
2012-04-11 12:01:05 (1011 KB/s) - `rhopoto_Omon_MPI-ESM-P_piControl_r1i1p1_185001-185912.nc' saved [1083611268/1083611268]
2012-04-11 12:18:25 (1.03 MB/s) - `rhopoto_Omon_MPI-ESM-P_piControl_r1i1p1_185001-185912.nc' saved [1083611268/1083611268]
2012-04-11 12:35:30 (1.04 MB/s) - `rhopoto_Omon_MPI-ESM-P_piControl_r1i1p1_185001-185912.nc' saved [1083611268/1083611268]
2012-04-11 12:49:44 (1.35 MB/s) - `rhopoto_Omon_MPI-ESM-P_piControl_r1i1p1_185001-185912.nc' saved [1083611268/1083611268]
2012-04-11 13:08:38 ( 960 KB/s) - `rhopoto_Omon_MPI-ESM-P_piControl_r1i1p1_185001-185912.nc' saved [1083611268/1083611268]
2012-04-11 13:26:11 (1.01 MB/s) - `rhopoto_Omon_MPI-ESM-P_piControl_r1i1p1_185001-185912.nc' saved [1083611268/1083611268]
2012-04-11 13:36:21 (1.78 MB/s) - `rhopoto_Omon_MPI-ESM-P_piControl_r1i1p1_185001-185912.nc' saved [1083611268/1083611268]
2012-04-11 13:50:53 (1.25 MB/s) - `rhopoto_Omon_MPI-ESM-P_piControl_r1i1p1_185001-185912.nc' saved [1083611268/1083611268]
2012-04-11 14:06:26 (1.15 MB/s) - `rhopoto_Omon_MPI-ESM-P_piControl_r1i1p1_185001-185912.nc' saved [1083611268/1083611268]
2012-04-11 14:19:43 (1.39 MB/s) - `rhopoto_Omon_MPI-ESM-P_piControl_r1i1p1_185001-185912.nc' saved [1083611268/1083611268]

This one failed 14 times before finally getting the "md5 ok" message -- it took 3 hrs 45 minutes to get this file:
'so_Omon_MPI-ESM-P_piControl_r1i1p1_189001-189912.nc' 'http://bmbf-ipcc-ar5.dkrz.de/thredds/fileServer/cmip5/output1/MPI-M/MPI-ESM-P/piControl/mon/ocean/Omon/r1i1p1/v20120315/so/so_Omon_MPI-ESM-P_piControl_r1i1p1_189001-189912.nc' 'MD5' '175d6c9dd3ffea30186e6bc9c7e3dee1'

This problem is sucking up my bandwidth and my time, which are not unlimited. Is there any remedy?  
--Jennifer

-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://mailman.ucar.edu/pipermail/go-essp-tech/attachments/20120411/5f9a4283/attachment.html 