Arcserve Backup を使用したデータの保護 › データのバックアップおよびリストア › バックアップ メディアのローテーションおよびスケジュールの設定 › GFS ローテーションの使い方 › GFS Rotation Scheme Media Example

GFS Rotation Scheme Media Example

The following example illustrates how to determine the number of media you need for a GFS rotation scheme:

会社の営業日が、月曜日から金曜日だと仮定します。月曜日から木曜日まで増分バックアップを毎日実行し、金曜日にフル バックアップを実行します。You have decided to retain monthly full backup data for six months before you recycle your media, and have specified that at least six monthly tapes are to be maintained in the Save Set of your media pool.In addition, you have specified that a minimum of four weekly tapes are to be retained in the Save Set.

注：For more information about media pools, Save Sets, and Scratch Sets, see "Managing Devices and Media."

In the GFS rotation scheme you have selected, the incremental backups are the Son, the weekly full backups are the Father, and the monthly full backups are the Grandfather.

Your rotation scheme requires four daily incremental backups, requiring one tape for each day.日単位のテープに保存されるデータは週単位のフル バックアップにも保存されるので、日単位のテープは毎週再利用されます。Therefore, your scheme requires four daily (Son) tapes.

The backup performed each Friday, the weekly full backup, requires one tape for each week of the month.These tapes are retained for one month before they are recycled, and you have specified that a minimum of four tapes are to be maintained in the media pool Save Set.Therefore, you require a minimum of five weekly (Father) tapes.

月の最後に実行したフル バックアップが、月単位のバックアップになります。You specified that these tapes are to be retained for six months, and that six tapes are to be maintained in the media pool Save Set.The minimum number of monthly tapes required before the media recycles is six.Therefore, you need seven monthly (Grandfather) tapes.

結果として、このローテーション スキーマに必要なメディアは合計16本になります。