NAME

       sge_aliases - Sun Grid Engine path aliases file format

DESCRIPTION

       The  Sun  Grid  Engine path aliasing facility provides administrators and users with the means to reflect
       complicated and in-homogeneous file system structures in distributed  environments  (such  as  user  home
       directories  mounted under different paths on different hosts) and to ensure that Sun Grid Engine is able
       to locate the appropriate working directories for executing batch jobs.

       There is a system global path aliasing file and a user local file.  sge_aliases  defines  the  format  of
       both:

       •  Blank lines and lines with a '#' sign in the first column are skipped.

       •  Each  line  other than a blank line or a line lead by '#' has to contain four strings separated by any
          number of blanks or tabs.

       •  The first string specifies a source-path, the second a submit-host, the third  an  execution-host  and
          the fourth the source-path replacement.

       •  Both the submit- and the execution-host entries may consist of only a '*' sign which matches any host.

       If  the -cwd flag (and only if - otherwise the user's home directory on the execution host is selected to
       execute the job) to qsub(1) was specified, the path aliasing mechanism is activated  and  the  files  are
       processed as follows:

       •  After  qsub(1)  has  retrieved  the  physical  current working directory path, the cluster global path
          aliasing file is read if present. The user path aliases file is read afterwards as if it were appended
          to the global file.

       •  Lines not to be skipped are read from the top of the file one by one while the translations  specified
          by those lines are stored if necessary.

       •  A  translation  is stored only if the submit-host entry matches the host qsub(1) is executed on and if
          the source-path forms the initial part either of the current working directory or of  the  source-path
          replacements already stored.

       •  As soon as both files are read the stored path aliasing information is passed along with the submitted
          job.

       •  On  the  execution  host,  the aliasing information will be evaluated. The leading part of the current
          working directory will be replaced by the source-path replacement if the execution-host entry  of  the
          path  alias  matches the executing host. Note: The current working directory string will be changed in
          this case and subsequent path aliases must match the replaced working directory path to be applied.

EXAMPLES

       The following is a simple example of a path aliasing file resolving problems with in-homogeneous paths if
       automount(8) is used:

       =====================================================
       # Path Aliasing File
       # src-path   sub-host   exec-host   replacement
       /tmp_mnt/    *          *           /
       # replaces any occurrence of /tmp_mnt/ by /
       # if submitting or executing on any host.
       # Thus paths on nfs server and clients are the same
       =====================================================

FILES

       <sge_root>/<cell>/common/sge_aliases
                     global aliases file
       $HOME/.sge_aliases   user local aliases file

SEE ALSO

       sge_intro(1), qsub(1), Sun Grid Engine Installation and Administration Guide

COPYRIGHT

       See sge_intro(1) for a full statement of rights and permissions.

SGE 6.2u5                                            $Date$                                       SGE_ALIASES(5)