DevOps Code ClearCase® is compatible with the
NFS automount facility that is supported on Linux and the UNIX system, though
certain guidelines apply.
Note: This topic is about mounting VOB storage, not to be confused with the automounting of VOBs.
For information about automounting VOBs, see
Automounting VOBs.
Hosts that run Linux or the UNIX system typically use the automounter to mount exported file
systems, including VOB and view storage directories, on remote hosts. Because various
DevOps Code ClearCase commands must derive a global pathname to
a VOB or view storage directory that has been (or will be) mounted by the automounter, you may need
to understand the details of how your automounter constructs the local mount points through which
remote storage is accessed.
Note: Implementations of automount vary. For
information about automount, see the reference information for your supported
platform.
Automounter maps and mount points
You
can use direct or indirect automount maps to access remote VOB or view storage.
The heuristics used to construct a global pathname assume that all hosts use
a common automounter map. If you create a VOB or view on a host that does
not use an automounter map, you must take additional steps to ensure network
access to the VOB or view. For more information, see The automounter on Linux or the UNIX system does not use the hosts map.
When
constructing a global path to remote VOB or view storage, DevOps Code ClearCase attempts
to access the remote host by using a pathname that begins with one of the
standard NFS mount points /net, /hosts,
or /nfs. For example, to construct a global path to VOB
storage on a host named mars, DevOps Code ClearCase starts
with the pathname /net/mars, and then adds the name of
the VOB storage directory specified in the mkvob command
or VOB creation wizard. If it cannot access the specified storage directory
using this path, it tries the other standard mount points.
Specifying nonstandard
mount points
You can use the environment variable CCASE_GPATH_HINTS to specify one or more mount points for
DevOps Code ClearCase to try before the standard mount
points are used. Set this environment variable to a value that is a colon-separated list of mount
points to try when constructing a global path to VOB or view storage on a remote host running Linux
or the UNIX system. For example, if you set
CCASE_GPATH_HINTS="/vob_servers:/view_servers",
DevOps Code ClearCase attempts to construct a pathname to a
remote NFS directory starting with the mount point
/vob_servers; if a valid
global path cannot be constructed from that mount point,
/view_servers is tried
next. If none of the mount points listed in CCASE_GPATH_HINTS can be used to construct a valid
global path,
DevOps Code ClearCase tries the standard
mount points.
Note: You can also set CCASE_GPATH_HINTS to a value of "" (null) to force
cleartool commands that create VOBs or views to use an explicit global storage
path as specified in the command-line interface. For more information, see the
env_ccase, mkvob, mkview, and
mkstgloc reference pages.
Specifying a nonstandard
mount directory
On most Linux or the UNIX system platforms, the automounter mounts remote file systems directly
on one of the standard mount points. Some automounters must mount remote file systems under
/tmp_mnt and then access them through a symbolic link to
/tmp_mnt from
/net or one of the other standard mount
points. If a
DevOps Code ClearCase host has an automounter that
creates this kind of symbolic link to some other mount point, you must specify the name of that
mount point in the file
/var/adm/devops/clearcase/config/automount_prefix. For
example, if the automounter uses
/autom instead of
/tmp_mnt, place this line in the
automount_prefix file:
/autom