06-07-2006
concept of mount point
Hi All
I Know it is a really basic and stupid question perhaps...But I am going bonkers..
I have following valid paths in my unix system:
1. /opt/cdedev/informatica/InfSrv/app/bin
2. /vikas/cdedev/app
Both refer to the same physical location. So if I created one file 'test' in first
path, when i cd to /vikas/cdedev/app and do a ls -ltr, i see the 'test' file
When I do a df -k . on 1 and 2 above, i get the same mount point which is as follows:
/vikas/cdedev/app
Now, I am perhaps taking a long shot, but the most logical reasoning I can give myself is mount point is nothign but actual physical location in hard drive whereas directories are logical pointers to mount points. So 1 and 2 above are logical pointers to the same physical location. In other words, they point to the same mount point.
I might be way off. In any case, can somebody throw some light on following:
a. concept of mount point as well as Unix file system?
b. Is it possible to see which directories refer to one particular mount point by some unix command?
Appreciate it much.
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LEARN ABOUT REDHAT
fs_rmmount
FS_RMMOUNT(1) AFS Command Reference FS_RMMOUNT(1)
NAME
fs_rmmount - Removes a mount point
SYNOPSIS
fs rmmount -dir <directory>+ [-help]
fs rm -d <directory>+ [-h]
DESCRIPTION
The fs rmmount command removes the mount point named by the -dir argument from the file system. The corresponding volume remains on its
host partition or partitions, but is inaccessible if there are no other mount points for it.
OPTIONS
-dir <directory>+
Names the mount point to delete from the file system. The last element in the pathname must be an actual name, not a shorthand notation
such as "dot" (".") or "dot dot" ("..").
Specify the read/write path to the directory, to avoid the failure that results from attempting to delete a mount point from a read-
only volume. By convention, the read/write path is indicated by placing a period before the cell name at the pathname's second level
(for example, /afs/.abc.com). For further discussion of the concept of read/write and read-only paths through the filespace, see the fs
mkmount reference page.
-help
Prints the online help for this command. All other valid options are ignored.
EXAMPLES
The following command removes the mount points jones and terry from the current working directory (the /afs/abc.com/usr directory).
% fs rmmount jones terry
PRIVILEGE REQUIRED
The issuer must have the "d" (delete) permission on the ACL of the directory that houses each mount point.
SEE ALSO
fs_lsmount(1), fs_mkmount(1)
COPYRIGHT
IBM Corporation 2000. <http://www.ibm.com/> All Rights Reserved.
This documentation is covered by the IBM Public License Version 1.0. It was converted from HTML to POD by software written by Chas
Williams and Russ Allbery, based on work by Alf Wachsmann and Elizabeth Cassell.
OpenAFS 2012-03-26 FS_RMMOUNT(1)