12-27-2001
back up probelm
Hi
I am using tar utility to take back up on HPUx and SUN 5.8 servers
yesterday i made some change.....in the cronjob
29 23 * * 1,3,5 echo "`date` COMPLETE BACKUP TAR `uname``hostname`">/dev/rmt/0myn
30 23 * * 1,3,5 tar cvf /dev/rmt/0mny <filesystems>
i am confused with the no rewind and rewind options
now when i am seeing the listing..
tar tvf /dev/rmt/0mny
It is giving error Tar Block size changed....
when i did
tar tvf /dev/rmt/0myn
it is giving error
tar Block size error
please suggest me wht to do..as it is a important back up
Previously i was taking back up with out the rewind ,no rewind option........and it was fine.....
thanks
Prafulla
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LEARN ABOUT OPENSOLARIS
chroot
chroot(1M) System Administration Commands chroot(1M)
NAME
chroot - change root directory for a command
SYNOPSIS
/usr/sbin/chroot newroot command
DESCRIPTION
The chroot utility causes command to be executed relative to newroot. The meaning of any initial slashes (/) in the path names is changed
to newroot for command and any of its child processes. Upon execution, the initial working directory is newroot.
Notice that redirecting the output of command to a file,
chroot newroot command >x
will create the file x relative to the original root of command, not the new one.
The new root path name is always relative to the current root. Even if a chroot is currently in effect, the newroot argument is relative to
the current root of the running process.
This command can be run only by the super-user.
RETURN VALUES
The exit status of chroot is the return value of command.
EXAMPLES
Example 1 Using the chroot Utility
The chroot utility provides an easy way to extract tar files (see tar(1)) written with absolute filenames to a different location. It is
necessary to copy the shared libraries used by tar (see ldd(1)) to the newroot filesystem.
example# mkdir /tmp/lib; cd /lib
example# cp ld.so.1 libc.so.1 libcmd.so.1 libdl.so.1
libsec.so.1 /tmp/lib
example# cp /usr/bin/tar /tmp
example# dd if=/dev/rmt/0 | chroot /tmp tar xvf -
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Availability |SUNWcsu |
+-----------------------------+-----------------------------+
SEE ALSO
cd(1), tar(1), chroot(2), ttyname(3C), attributes(5)
NOTES
Exercise extreme caution when referencing device files in the new root file system.
References by routines such as ttyname(3C) to stdin, stdout, and stderr will find that the device associated with the file descriptor is
unknown after chroot is run.
SunOS 5.11 15 Dec 2003 chroot(1M)