What is a full-scale dump, what is an incremental dump, and what are the advantages and disadvantages?

Source: Internet
Author: User

There are two basic ways to create a copy of a file.

The first relatively simple method is called a periodic dump (or a full-volume dump, a periodic fallback). This approach is to transfer the contents of all the files in the memory to a certain medium, usually a tape or a disk, at a fixed time period.

Advantages:

The file system can re-assemble the files, placing all the blocks of the user scattered throughout the disk in a contiguous manner. This way, when you start the system again, access to the user's files is much faster.

Disadvantages:

1. The file system may be forced to stop working during the entire dump.

2, the dump generally takes a relatively long time, it depends on the size of the system and the speed of the tape drive.

The other is an incremental dump, a technique that dumps only information that has changed since the last dump, that is, only those files that were subsequently created or changed will be dumped.

Advantages:

1. The file system can re-assemble the files.

2, can meet the requirements of rapid recovery and recovery to the state of the failure of the system.

3, can be carried out in a shorter period of time.

Disadvantages:

The updated file must be marked and eliminated after the dump.

What is a full-scale dump, what is an incremental dump, and what are the advantages and disadvantages?

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