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Full Discussion: Normal LOFS behaviour?
Operating Systems Solaris Normal LOFS behaviour? Post 302300033 by blowtorch on Monday 23rd of March 2009 03:44:34 AM
Old 03-23-2009
Normal LOFS behaviour?
I've got one directory LOFS mounted on top of another (this is to help move from an older standard that we used to follow to a newer one that we will be).

Something like this:

Code:
bash-3.00# df -k | grep /x
/dev/md/dsk/d4       77449687   88172 76587019     1%    /x
/x                  77449687   88172 76587019     1%    /app

Now,
Code:
bash-3.00# cd /x
bash-3.00# ls
ControlMagent6.2  admin             home              oracle
InfraData         dbatools          lost+found
bash-3.00# cd /app
bash-3.00# ls
ControlMagent6.2  admin             home              oracle
InfraData         dbatools          lost+found

which is fine.
But,
Code:
bash-3.00# cd /app/dbatools
bash-3.00# ls
DBE_DBATOOLS  lost+found    open_client
bash-3.00# cd /x/dbatools
bash-3.00# ls
bash-3.00#

The thing to note here is that /app/dbatools is a separate filesystem as opposed to just being a directory.
Code:
bash-3.00# df -k /app/dbatools
Filesystem            kbytes    used   avail capacity  Mounted on
/dev/vx/dsk/oracle_locdg/dbatools
                     9437184  571386 8311701     7%    /app/dbatools

The DBAs have scripts that are referring to /x/dbatools and expecting to find other scripts/commands to execute under that directory, and the lack of any directory structure under /x/dbatools is causing them to fail.

Is this normal behaviour for LOFS mounted filesystems? If I mount x on top of y, and create a mountpoint z that uses x as part of the directory name, will I not be able to access the mountpoint z by using y as part of the directory name?
 

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LEARN ABOUT HPUX

automountd

automountd(1M)															    automountd(1M)

NAME

       automountd - autofs mount/unmount daemon

SYNOPSIS

       name=value]

DESCRIPTION

       is  an  RPC  server  that  answers file system mount and unmount requests from the filesystem.  It uses local files or name service maps to
       locate filesystems to be mounted.  These maps are described with the command (see automount(1M)).

       The daemon is automatically invoked if the variable is set to 1 in

   Options
       Trace.  Expand each
			 RPC call and display it to

       Verbose.  Log status messages to

       Turn off browsing for all
			 mount points.	This option overrides the map option on the local host.

       Force all mounts to the local host to be NFS mounts instead of
			 the default LOFS mounts.  This is necessary for highly available NFS mounts.

       Assign		 value to the indicated map substitution variable.  These assignments cannot be used to substitute variables in the master
			 map

   Tracing
       While is running, the signal can be sent to to turn tracing on. It logs messages in To turn tracing off, send the signal again.

RETURN VALUE

       returns:

	      0 successful

	      1 failure

EXAMPLES

       To turn on tracing, enter:

       or

       No messages are displayed by the trace.	Check the results in

WARNINGS

       Any filesystems that are being managed by should never be manually mounted or unmounted.  Even if the mount or unmount operation appears to
       complete successfully, the resulting change of state to the managed filesystem can lead to disruptive or unpredictable  results,  including
       but not limited to: commands hanging or not returning expected results, and applications failing due to their dependencies on those mounted
       filesystems.  A reboot may be necessary to resolve these issues.

AUTHOR

       was developed by Sun Microsystems, Inc.

FILES

       master map for automounter
       log file for automountd
       daemon

SEE ALSO

       automount(1M).

																    automountd(1M)
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