12-03-2014
I apologize to the moderator and others if I overstepped the bounds here. We have a number of customers who have stated that it is "less hassle" using SBAdmin than setting up a separate NIM server and making multiple backups (mksysb and savevg).
Because we have a 30-day trial, he could use that to clone the system for free. As I stated in my original message, mksysb is a good tool to use for the clone. My intention was just to offer up another solution. Of course I am biased as to the value of SBAdmin over NIM+mkssyb+savevg, so I'll keep that in mind before posting.
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ffm(4) Kernel Interfaces Manual ffm(4)
NAME
ffm - File-on-File Mounting File System
STANDARDS
Interfaces documented on this reference page conform to industry standards as follows:
fattach(): XSH4.2
fdetach(): XSH4.2
Refer to standards(5) for more information about industry standards and their associated tags.
DESCRIPTION
The File-on-File Mounting (FFM) file system allows regular files, character device special files, or block device special files to be
mounted on regular files or directories.
The ffm file system is used with the System V Release 4-compatible library functions fattach(3) and detach(3) to enable a user process to
have one file descriptor pointing to the data associated with a named file and a named STREAM. When one name is active, the other name is
invisible.
For example, a user application mounts a file descriptor from a file named a_file on a file that is named b_file. The file descriptor of
file a_file is accessible by two names, a_file and b_file. However, when the user application attempts to open either file, only the file
descriptor for a_file is returned: the file descriptor for b_file is invisible while a_file is mounted over it.
The fattach(3) function mounts a file over another; the fdetach(3) function removes the association so the underlying file can be accessed.
The user process can also mount a regular file over a regular file in order for it to be a clone of the underlying file. [Do not confuse
this clone with an AdvFS clone fileset.] In this case, the clone file is a character device special file that is associated with a device
driver that handles such files. As a result, a user can specify one clone entry and then open this device multiple times. Each time the
device is opened, a new vnode is obtained but exactly the same device behavoir is also obtained: the behavior is cloned.
That mount occurs if the -o clone option is used in the mount command or as an element of a ffm line in the /etc/fstab file. In this case,
there are two files with identical contents, separate names, and separate file descriptors.
EXAMPLES
The following example shows an ffm mount of a_file on b_file. If the du command were executed, its display would show a_file in the file
system column and b_file in the Mounted on column:
# mount -t ffm a_file b_file
The following example shows an ffm mount of a_file on b_file, with the mount -o clone option specifying that a_file is a clone of b_file.
# mount -t ffm -o clone a_file b_file
RESTRICTIONS
The user process must be the root user or must be the owner of the files and must have write permissions for the files.
[Tru64 UNIX] Before you can use the ffm file system, you must configure the kernel option FFM_FS into the kernel. See System Administra-
tion for information about configuring the kernel.
RELATED INFORMATION
Commands: fdetach(8), mount(8)
Functions: fattach(3), fdetach(3), isastream(3), chmod(2), mount(2)
Interfaces: streamio(7)
Files: fstab(4)
Standards: standards(5) delim off
ffm(4)