12-21-2006
Because you're not telling tar to append. You're overwriting the tape every time, starting at the beginning of the tape and writing towards the end. It's like overwriting the same file every time.
You're archiving with something like 'tar -cf /dev/rmt/0', yes? That creates a
new archive every time, overwriting the parts you've already saved to. 'tar -rf /dev/rmt/0' will append to an
existing archive. See 'man tar' for details.
here is a google groups thread describing the process.
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LEARN ABOUT CENTOS
tar_append_regfile
tar_append_file(3) C Library Calls tar_append_file(3)
NAME
tar_append_file, tar_append_eof, tar_append_regfile - append data to tar archives
SYNOPSIS
#include <libtar.h>
int tar_append_file(TAR *t, char *realname, char *savename);
int tar_append_regfile(TAR *t, char *realname);
int tar_append_eof(TAR *t);
VERSION
This man page documents version 1.2 of libtar.
DESCRIPTION
The tar_append_file() function creates a tar file header block describing the file named by the realname argument, but with the encoded
filename of savename. It then sets the current header associated with the TAR handle t to the newly created header block, and writes this
block to the tar archive associated with t. If the file named by realname is a regular file (and is not encoded as a hard link),
tar_append_file() will call tar_append_regfile() to append the contents of the file.
The tar_append_regfile() function appends the contents of a regular file to the tar archive associated with t. Since this function is
called by tar_append_file(), it should only be necessary for applications that construct and write the tar file header on their own.
The tar_append_eof() function writes an EOF marker (two blocks of all zeros) to the tar file associated with t.
RETURN VALUES
On successful completion, these functions will return 0. On failure, they will return -1 and set errno to an appropriate value.
ERRORS
The tar_append_*() functions will fail if:
EINVAL Less than T_BLOCKSIZE bytes were written to the tar archive.
EINVAL Less than T_BLOCKSIZE bytes were read from the realname file.
They may also fail if any of the following functions fail: lstat(), malloc(), open(), read(), th_write(), or the write function for the
file type associated with the TAR handle t.
SEE ALSO
read(2), open(2), lstat(2), th_write(3)
University of Illinois Jan 2001 tar_append_file(3)