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Chapter 4: Restoring System Software

Backup Strategy Data is sometimes lost by a user either accidentally

removing or overwriting a file or misusing a command.

A power failure could corrupt data or cause a hard disk

crash.

CAUTION

✸

Failure to maintain system recovery tapes could

result in downtime and costs that could otherwise

be avoided.

Data can be restored if you follow proper backup

strategies – one of the most important responsibilities of

the system administrator is to implement a solid backup

strategy.

The backup strategy you use to protect from data loss

depends on a number of variables such as:

■ How heavily is the system used?

■ How often does the data change?

■ How critical is it that files can be restored

quickly?

A typical three-tiered backup strategy:

1 Make a new system recovery tape after:

■ Loading new or updated software.

■ Adding or removing users.

■ Changing logical volumes in any way.

■ Updating with software that changes the kernal.

■ Changing the root password (you can use the

recovery system only if you know the root

password from when the tape was created).

Instructions are given in Making a System

Recovery Tape on page 4-19.

NOTE

Individual files CANNOT be selected for

recovery from a system recovery tape.

2 Create a full system backup using SAM once each

week.

Instructions are given in Making a Data Backup

Tape on page 4-26.

NOTE

Individual files CAN be selected for recovery

from a system backup tape.

3 Create an incremental backup using SAM once each

day.

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