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Sidewinder G2 6.1.2 Administration Guide - Glossary of Technical ...

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Appendix F: Basic Troubleshooting<br />

Backing up system files<br />

Performing an<br />

incremental backup<br />

640<br />

Note: While incremental backups can eliminate multiple copies <strong>of</strong> unchanged files,<br />

using incremental backups does increase the duration and complexity <strong>of</strong> the<br />

restore process. If you have a fast tape drive and the level 0 backup fits onto a<br />

single tape, you may want to consider performing only level 0 backups.<br />

Tip: How <strong>of</strong>ten you should perform incremental backups depends on many factors,<br />

such as how much your system is used. The UNIX System <strong>Administration</strong><br />

Handbook <strong>of</strong>fers several types <strong>of</strong> schedules that meet various needs.<br />

The following example shows an incremental backup (Level >0) that backs up<br />

four file systems. The backed up files are labeled file 1 through file 4.<br />

Level 5 dump for /var as file 1 to /dev/nrst0 on Fri Feb 17<br />

03:00:03 CST 1995<br />

Level 5 dump for /usr as file 2 to /dev/nrst0 on Fri Feb 17<br />

03:00:11 CST 1995<br />

Level 5 dump for / as file 3 to /dev/nrst0 on Fri Feb 17<br />

03:01:33 CST 1995<br />

Level 5 dump for /var/log as file 4 to /dev/nrst0 on Fri Feb<br />

17 03:06:10 CST 1995<br />

The following example performs an incremental backup <strong>of</strong> the /usr file system.<br />

The tape will not be rewound, and the backed up file will not be compressed.<br />

1 Attach a keyboard and monitor directly to your <strong>Sidewinder</strong> <strong>G2</strong> and reboot.<br />

If your system has multiple keyboard/monitor connection ports, you must<br />

attach the keyboard and monitor into the same keyboard/monitor connection<br />

port pair (that is, attach both items either to the front connection ports<br />

or the back connection ports).<br />

2 Enter the following command at the command prompt:<br />

shutdown -g now<br />

3 Press Enter when asked whether to check and mount all file systems. The<br />

system prompt will appear.<br />

If you have enabled authentication for the administrative kernel, you will be<br />

prompted to log in before the system prompt appears.<br />

4 Insert a backup DAT into the tape drive and wait for the tape to reach its<br />

load-point.<br />

5 Type the following command to run the incremental backup script,<br />

Important: You must type this command for each file system except /tmp.<br />

/etc/backups/do.dump /usr level filenum<br />

where:<br />

• level = the backup level (see Incremental backup on “Performing an<br />

incremental backup” on page 639)

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