IBM 000-8697 User Manual

Operating OnLine

A level-1 archive contains a copy of every disk page that has changed since the
last level-0 archive. All disk page copies on the tape reflect the contents of the
disk pages at the time the level-1 archive began.

A level-2 archive contains a copy of every disk page that has changed since the
last level-0 or level-1 archive, whichever is most recent. All disk page copies
on the tape reflect the contents of the disk pages at the time the level-2 archive
began.

 illustrates an incremental archiving strategy. Each of the archive

levels is defined as follows:

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Level-0 archive is created once every nine days.

■

Level-1 archive is created once every three days.

■

Level-2 archive is created once a day.

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