2.4 Where's what ? A guided tour of the directory tree of the archive machine alohi

2.4.1 Filesystems

The archive system currently relies on two hard disks:

• /archive (/dev/sd4g) contains the working directories of the daemons that is is used as a buffer for the data to be archived. Its big capacity of 1.6 Gb allows for a temporary pipeline disruption (such as when the media are full) without a risk of overflow. See 2.1 for the name of the current daemon working directories.
• /archive/sw (/dev/sd4h)contains all the source code of the archive programs, the listfiles and the logfiles.

We now describes more thoroughtly /archive/sw:

• /archive/sw/daemon contains the source codes of the archive daemons. Files in this directory are under RCS.
• /archive/sw/aiqe contains all the AIQE stuff that has just been copied from the old archiving system (see on-line documentation and [1] for a description).
• /archive/sw/handler contains the source codes of the media handlers and the media initializers.
• /archive/sw/par contains the parfiles for the daemons. Files in this directory are under RCS.
• /archive/sw/log contains the current logfiles of the daemons. /archive/sw/log/old contains the old logfiles.
• /archive/sw/list contains the listfiles of the daemons. /archive/sw/list/old contains the old listfiles. /archive/sw/list/old/maxtor_od contains the very old listfiles, back to the time of the maxtor optical disks.
• /archive/sw/adm contains the administation tools described in the next chapter.Files in this directory are under RCS.
• /archive/sw/etc contains routines used by several daemons, generally imported from the Pegasus project.
• /archive/sw/docs contains all the documentation related to the CFHT archiving system including [1] and this document.
  

2.4.2 Archive Devices

Data are physically archived on devices attached to alohi. The following devices are currently available:

• /dev/rmt0: High density Exabyte drive
• /dev/rmt1: High density Exabyte drive