Files on disk on the Fermi Xrootd cluster
Infrequently the xrootd servers are scanned to find all the files that are on disk. Instead of scanning everything below /glast the scan is split into the subdirectories
/glast/ASP, /glast/Data, /glast/bt, /glast/level0, /glast/mc
The results of the scans are stored in the directory
/nfs/farm/g/glast/u15/xrootd/files_on_disk/<YYYYMMDD>
where <YYYYMMDD> is the date the scan was taken.
There is also a link
/nfs/farm/g/glast/u15/xrootd/files_on_disk/current
that points to the most recent file listing.
Output files
File listings
For each subdirectory that is scanned the results are stored in the file:
filelist<topdir>
and <topdir> is the directory the scan started and '/' are replaced by '_'. For example:
the files below /glast/Data are stored in filelist_glast_Data.
each line contains the
size(Bytes) atime mtime ctime filename host [migrate-status]
The migrate-status field is optional with vaules:
status |
description |
|---|---|
-1 |
migrate status could not be determined (no lock file) |
0 |
not migrated |
1 |
migrated |
e.g. :
1461254 1185332890 1178747325 1178747325 /glast/mc/ServiceChallenge/backgndSC-GR-v11r2/merit/backgndSC-GR-v11r2-000008-merit.root sulky02
The lines are sorted with respect to the data file names.
duplicate files
usage by directory
info file
The info file contains the date the listing was obtained.