HPSS ( High Performance Storage System) is a system to organize the storage of big volumes of data. Read carefully the FAQ before any attempt to work with it.

H1 has space in the production machine, at the path:

• ccmdrs11:/hpss/in2p3.fr/group/hera1 = $H1HPSS

where $H1HPSS is an environment variable. This space is accessible only to registered users (at present: Cassol Brunner, Diaconu,Matti,Sauvan,Schneider). Each user should write his personal files in

$H1HPSS/users/[user] 

$H1HPSS/...

The search of files in the HPSS tree is very slow. A parallel data-base has therefore been developed to keep trace of the files copied in HPSS. The H1 HPSS data-base is a mirror of $H1HPSS in $THRONG_DIR:

• $THRONG_DIR/h1hpss_db= $H1HPSS_DB

Each file in the data-base has the same path and name than in HPSS, but its content is substituted with statistic about the file. For example:

Device : 0
Inode number : 1
Protection : -rwxrwxr-x (100775)
Hard Links : 1
Uid : 2078 (cassol)
Gid : 116 (hera1)
Size (bytes) : 500041080
Last access : Wed Jul 11 09:38:18 2001
Last modify : Wed Jul 11 09:43:48 2001
Last stat. mod. : Wed Jul 11 09:43:48 2001


Special commands have been created to guarantee the correct update of the data-base. The H1 user must access $H1HPSS only through these commands!
They are:

• h1rfcp [file1] [file2] :
  copy a file to/from $H1HPSS. The path of the files must be absolute.

• h1rfmkdir [dir] :
  create a directory in $H1HPSS. The path of the directory can be relative to $H1HPSS (for example: "h1rfmkdir pippo" and "h1rfmkdir $H1HPSS/pippo" are equivalent).

• h1rfdir [dir] :
  perform a "ls" of the directory [dir] in the data base. The path of the directory can be relative to $H1HPSS.

• h1rfrmdir [dir] :
  remove the directory [dir] in $H1HPSS and in the data-base. The path of the directory must be absolute.

• h1rfrm [file] :
  remove the file [file] in $H1HPSS and in the data-base. The path of the file must be absolute.

• h1rfstat [file] :
  Show the content of [file] in the data-base. This content corresponds to the file statistic in HPSS. The path of the file can be relative to $H1HPSS.

• h1rftot [dir] :
  list the number of MB written in the directory [dir] and in all its sub-directories. The path of the directory can be relative to $H1HPSS.

HPSS file can be accessed by Root in an interactive section using the TFile::Open function and preceeding the file name by "rfio::". For example:

TFile* f=TFile::Open("rfio:ccmdrs11:/hpss/in2p3.fr/group/hera1/users/cassol/pippo.root")

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