Summary of HEASARC ftp+http file transfer statistics in the month of April 2002

(This includes legacy ftp & http stats, and cossc ftp stats for CGRO,
and also includes Imagine the Universe legacy http statistics) 

_____________________________________________________________________________
TOTAL FTP+HTTP TRANSFERS FROM ALL LEGACY DIRS = 131.9 GB + 340.6 GB = 472.5 GB
        AND FTP TRANSFERS FROM ALL COSSC DIRS =  1.15 GB
_____________________________________________________________________________

 THE MOST POPULAR (> 1 GB of data transferred) DIRECTORIES (COMBINED FTP STATS
                 OF LEGACY & COSSC THIS MONTH):

                                 Raw Totals        Corrected totals assuming
                     files      GB     %Total(GB)  % retrieved = % tarred
                                                      GB       %Total(GB)

Directory: asca       3938     6.98     5.25%        9.34       7.02%
           compton    2177     1.25     0.94%        1.25       0.94%
           euve         56     1.37     1.03%        1.37       1.03%
           heasarc     779     1.60     1.20%        1.60       1.20%
           retrieve    342    16.31    12.26%        ----       -----
           rosat      1719     2.66     2.00%        3.49       2.62%
           software   2586    27.06    20.34%       27.06      20.34%
           xmm        3403     5.54     4.16%        5.95       4.47%
           xte      168283    70.12    52.70%       82.16      61.75%

    subtotal of              132.89    99.88%      132.22      99.38%
     above dirs       
___________________________________________________________________________

              2001-2002 Global Summary of HEASARC Server Statistics

               FROM FTP DIRS         FROM MISSION DIRS      FROM ALL DIRS
 SERVER +>     FTP         FTP        HTTP      HTTP       HTTP      FTP+HTTP
 MONTH         FILES    GIGABYTES     FILES  GIGABYTES    GIGABYTES  GIGABYTES
 -----         -----    ---------    -----  ---------     ---------  --------  

  Jan 2001  52257*     184.68*       10910       0.60     130.71^     315.40*
  Feb      181578*     166.91*       13694       0.35     133.69^     300.60*
  Mar       35535*     136.98*        8978       0.25     137.73^     274.71*
  Apr#     128551*     125.62*       14941       0.39     126.94^     252.56*
  May+     343076*     244.21*       19162       0.28     138.43^     382.64*
  Jun+     562103*     270.31*        4605       0.24      96.92^     367.24*
  Jul~      71816*     134.66*        4201       1.35      76.37^     211.03*
  Aug       55343*     176.74*         --         --       80.49^     257.23*  
  Sep       93883*     207.66*        2742       1.08      98.70^     306.36*
  Oct       49717*     270.69*       13426       2.45     139.43^     410.13*
  Nov      101225*     184.16*        7135       0.80     143.51^     327.68*
  Dec&      66804*     148.85*        6804      11.03     124.84^     273.69*

  Jan 2002 235252*     215.23*       17410      12.47     189.51^     404.75*
  Feb       59644*     157.28*        4517      13.12     174.92^     332.20*
  Mar      123745*     221.63*        8454      11.83     261.58^     483.20*
  Apr      185311*     133.05*        5474      17.64     340.57^     473.61*
  May
  Jun
-----------------------------------------------------------------------------
 * includes cossc ftp stats            
 ^ includes imagine http stats
 # A RAID failure on April 26-30 2001 meant that many datasets were offline
 + Increased by a large amount of RXTE data copied by UCSD in May and June 2001
 ~ A RAID failure on July 28-31 2001 meant that many datasets were offline
 & Problems with the ftp server in December 2001 meant that data retrievals
   were made only using the http server for a period of about five days. After
   that time, users can retrieve using either the ftp or the http server.
____________________________________________________________________________

           Detailed Breakdown of Current Month by Directory

  Note that usage statistics on ftp, Gopher and the Web are directly 
  available (on a month-by-month basis) on the Web: the URL is 
  http://heasarc.gsfc.nasa.gov/stats/statsmain.html. In general, directories 
  correspond to specific missions, e.g., rosat to ROSAT, asca to ASCA, etc.,
  with the following exceptions:  the caldb directory contains some 
  multi-mission calibration data (mission specific caldb data are credited
  to the mission not to caldb), fits_info contains FITS-related files, heasarc 
  contains complete database catalogs, and software contains multi-mission 
  software.
 
 Transfer Protocol:        ftp                        http
                       files  Mbytes   %Total      files   Mbytes      
/FTP                                              
Directory: ariel5         7      0.1    0.00%          
           asca        3938   6984.8    5.25%        535     31.5
           astroe        29      1.8    0.00%          
           bbxrt         11      0.3    0.00%          
           caldb       1151     24.8    0.02%          
           chandra        0      0.0    0.00%          
           compton     2177   1249.7    0.94%         20      0.8
           copernicus     4      0.1    0.00%         
           cosb           0      0.0    0.00%         
           dxs            0      0.0    0.00%         
           einstein      15     10.7    0.01%         17      5.7
           euve          56   1374.1    1.03%          1      0.1
           exosat       418      6.0    0.00%         70      0.7
           fits_info     70      5.0    0.00%         49    221.6
           ginga         38      8.0    0.01%        250      1.4
           heao1          2      0.0    0.00%         
           heao3          0      0.0    0.00%          1      0.1
           heasarc      779   1602.2    1.20%        699   1419.1
           hete2          4      1.4    0.00%          
           htxs           0      0.0    0.00%          
           oso8           0      0.0    0.00%          
           retrieve     342  16307.2   12.26%        415  15191.7
           rosat       1719   2664.2    2.00%       2234     57.9
           sas2           3      0.1    0.00%          
           sas3           0      0.0    0.00%          
           sax          229     86.1    0.06%          4      0.1
           software    2586  27064.5   20.34%        293    408.6 
           vela5b         5      4.3    0.00%          6      2.7
           xmm         3403   5536.3    4.16%        170     62.7
           xte       168283  70116.5   52.70%        642    239.4
           other         42      0.2    0.00%         68      0.8

           TOTAL:    185311 133048.3  100.00%       5474  17644.9

Note:     (i) Junk directories, as well as the top level of the ftp area, are
          not explicitly listed due to their low usage statistics, but these
          transfers have been included in the "other" category.
          (ii) The breakdown by mission of data copied from the retrieve area
          cannot be directly estimated, but the breakdown by mission of data
          tarred and placed in the retrieve area can be: of 40.08 GB tarred,
          73.86% were RXTE data, 14.48% ASCA data, 5.06% ROSAT data, 
          3.65% BeppoSAX data, and 2.53% XMM-Newton data.
 
 (**) The cossc ftp statistics are included here.
______________________________________________________________________________

   Web directories relevant to HEASARC (all by http transfer)

                    # of files   # of Megabytes

           ab           12,102         79.1
           argus           196          2.0
           astrobrowse     244          3.8
           audio       108,430      60810.6
           classx          542         16.9
           cgi-bin      37,068        643.8
           db-perl      10,071       1219.2
           docs      2,115,637     119805.3
           fitsio        1,815         58.3
           ftools        9,730         73.0
           FTP           5,474      17644.9   the breakdown is given above
           hera          6,058        162.5
           Images    5,172,003      37019.9
           images       82,236        613.3
           lheasoft     27,758        616.8
           listserv     15,792        100.0
           mail_archive 11,289         76.7
           RPS           1,497         19.3
           scripts       6,476         41.8
           stats         2,575         56.9
           Tools         3,519        450.5
           topbase         999         21.5
           Videos       26,196      24165.1
           W3Browse     12,542        109.4
           webspec         880         15.8
           WebStars      1,104          6.4
           wgacat          621          9.2
           xanadu        3,372        378.7
           xclasses      1,280          5.6
           xstar           373          3.5
           xte_weather  14,069       1649.6

Imagine the Universe 4,656,939      73644.4 MB