Hi!

I need a help to create two(2) shell script to speed up backup and restore and optimize the ammount
used on tape. I use TAPE IBM LTO Ultrium 3 (using hardware compression) in a server RISC IBM p520 4 proc of 1,5 ghz, 2 GB mem, 4 disks of 143 GB 15Krpm.  The backup of 33 GB has lasted about 1 hour and I think I can speed up the process improving the software compression. System is idle on moment
of backup.


Shell Script 1- compress and backup a full directory recursivelly (all files) or individual file directly to the tape (like tar).
One line script with pipe(s) would be great (to improve speed!!).

Backup:

"backup_script.sh"  dirpath or filepath /dev/rmt0

- DON´T COMPRESS  THE ORIGINAL SOURCE FILE(S) / DIRECTORIES , COMPRESSED FILES ONLY
IN TAPE. THE COMPRESS INTERMEDIARY PROCESS SHOULD  NOT CHANGE, AT ANY MOMENT,
THE ORIGINAL SOURCE FILE(S) OR DIRECTORY(IES) .

- DUPLICATE THE FILE FOR TEMPORARY JOB IS NOT DESIRABLE DUE TO DISK IO PERFORMANCE
IMPACT.

Shell Script 2 - restore a full directory recursivelly or specific file from the tape

Ex: "restore_script.sh"  dirpath or filepath  /dev/rmt0

- DIRECT File Restore without pre-restoring a big file container (Example: a full tar or compressed file)

restore 1 GB tar.Z file  to the disc for further restoring a single and small
file would be bad. So I imagine each file be compressed individually before writing to tape,
during the backup process,  instead generating a big compressed file with all files before
writing to the tape.

Compress tool can be gzip, pkzip, compress, bzip, etc.

Ex:


1- before backup

/home/dir1/file1
/home/dir1/file2
/home/dir2/file3
/home/dir2/dir3/file4
/home/dir2/dir4/file5

2 - backinp up

Backup examples:

a) "backup_script.sh"  /home/dir1 /dev/rmt0

b) "backup_script.sh"  /home/dir2/dir4/file5  /dev/rmt0


3 - After  backup (files on tape, JUST one example, is not necessary write files separately, it is just
my idea to improve the restore of individual files !!!)

a) /home/dir1/file1.Z
    /home/dir1/file2.Z

b) /home/dir2/dir4/file5.Z

4 - Restore examples

Ex:

a) "restore_script.sh"  /home/dir1 /dev/rmt0

b) "restore_script.sh"  /home/dir2/dir4/file5.Z  /dev/rmt0


Best Regards,
Artur Dietrich