02-21-2009
Mksysb for linux
Aix is a unix based os developed by IBM and was originally released in the mid 80s for PC RT. When IBM released the RS/6000 in 1992, it released AIX 3.1 and built in is a mksysb script to do a full rootvg or OS backup. Other volume groups are not touched by this script. It was aimed at scsi tape drives. When booted from tape, the system would be restore rootvg to exactly what it contained when it was backed up. When finished, the system reboots. IBM never supported writing to cd but went directly to dvd. A mksysb can be written to dvd and then booted and restored from dvd. This function would be VERY helpful to linux releases or unix released. What was described earlier is simillar to a product in AIX called Network Install Manager - nim. Using nim, a root user can do a bootable backup to a remote system and then restore from that system. A nim restore is the fastest form of installing AIX and is used by manufacturing to preload systems. Today, at AIX 6.1, nim and mksysb are mature and trusted processes. Non rootvg volume groups are backed up using savevg. savevg is better than tar as it creates logical volumes the correct size and correctly names the mount points and then restores the data. Again, its a mature process. Even open files are backed up with mksysb and savevg although any save to the file after its backed up isn't reflected. A mksysb has 3 components, A boot image, a complete list of files and the actual backup. When the mksysb is taken, it compares what is on the list to what is on the tape in the backup. They must agree. Again, the same for linux would be helpful. I am looking for one for an OS backup of Fedora Core 9 or 10. I believe the linux developers like Red Hat or SUSE or Debian, are best equipped to create such a backup program as they best know their own OS.
Last edited by allanhubbert; 02-21-2009 at 08:49 AM..
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GSIGNAL(3) Linux Programmer's Manual GSIGNAL(3)
NAME
gsignal, ssignal - software signal facility
SYNOPSIS
#include <signal.h>
typedef void (*sighandler_t)(int);
int gsignal(intsignum);
sighandler_t ssignal(int signum, sighandler_t action);
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
gsignal(), ssignal(): _SVID_SOURCE
DESCRIPTION
Don't use these functions under Linux. Due to a historical mistake, under Linux these functions are aliases for raise(3) and signal(2),
respectively.
Elsewhere, on System V-like systems, these functions implement software signaling, entirely independent of the classical signal(2) and
kill(2) functions. The function ssignal() defines the action to take when the software signal with number signum is raised using the func-
tion gsignal(), and returns the previous such action or SIG_DFL. The function gsignal() does the following: if no action (or the action
SIG_DFL) was specified for signum, then it does nothing and returns 0. If the action SIG_IGN was specified for signum, then it does noth-
ing and returns 1. Otherwise, it resets the action to SIG_DFL and calls the action function with argument signum, and returns the value
returned by that function. The range of possible values signum varies (often 1-15 or 1-17).
CONFORMING TO
These functions are available under AIX, DG/UX, HP-UX, SCO, Solaris, Tru64. They are called obsolete under most of these systems, and are
broken under Linux libc and glibc. Some systems also have gsignal_r() and ssignal_r().
SEE ALSO
kill(2), signal(2), raise(3)
COLOPHON
This page is part of release 3.25 of the Linux man-pages project. A description of the project, and information about reporting bugs, can
be found at http://www.kernel.org/doc/man-pages/.
2007-07-26 GSIGNAL(3)