Folks, after an incident of 100% full home disk on pii3 (pii3:/home) I took at look at the disk usage in some detail. In a nutshell, I found that we have been careless in using disk space. If my analysis is correct, increasing the amount of available free disk space will not be effective in fixing the problem of permenently low disk space on pii3:/home. I will say naught about why it is a good idea to have a lot of free space on our home disk. My recomendation/request is to ask people to review the content of their home directories on pii3 with a view to delete unneeded large files, and do so periodically. These are a few comments on what I found: 1) no big raw data files. Aparently we have been good at keeping raw data files on scratch disks. Two (nameless) users had/have large data files in their home directories and got private email asking them to do something about it. 2) a disappointing huge amount of large uncompressed "tar" files. In this age of gzip and bzip2 there is little excuse to keep around uncomrepssed tar files. Many of these files are old and quite a few have names like "brat.tar" or "root-version-xxx.tar" or "cernXXX.tar". 3) a large number of big what looks like montecarlo files. Perhaps these also belong on scratch disks? Attached below is a list of how much space is used by each pii3 user: [root@pii3 /home]# ~olchansk/bin/DU -k * 28858 aholm 116534 beam 626681 bearden 1029691 brahmlib 2160 brahms-bugs 677035 bucharest 4334 cerenkov 162445 cern 379014 daq 22012 daqlab 208569 daqpmt 158332 drift 98660 ekman 181345 fstof 9678 ftp 7657 guest 8024 gushue 333194 hagel 269 hirg 613391 hito 16340 httpd 152924 jhlee 19829 justice 102861 kansas 1 kde 217368 krakow 12 lost+found 233889 mcbreen 4625 mjmurray 11175 mult 603938 nbi 66 offline 411843 olchansk 91223 online 39478 operator 23568 rami 1 root 59199 rpms 1 samba 19 save-pii3-files 72 scheetz 131 slowc 65 tamu 65 tofw 480025 tpc 65 trigger 464286 videbaek 558516 zdc [root@pii3 /home]# -- Konstantin Olchanski Physics Department, Brookhaven National Laboratory, Long Island, New York olchansk@bnl.gov
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