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lun show -instanceを指定して、Used SizeがLUN Sizeよりも大きいのはなぜですか。

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環境

  • Logical Unit Number(LUN;論理ユニット番号)
  • ONTAP 9

回答

Used Size 通常LUN Size 、次の理由よりも少し大きくなります。

  • LUN Size 実際のユーザデータを格納する L0 ブロックの合計サイズのみをレポートします。 
  • Used Size メタデータ / 非ユーザデータを保持する合計 L0 ブロックと間接ブロックのサイズを報告します。

cluster::> lun show -instance

                  Vserver Name: svm1
                      LUN Path: /vol/vol1/lun1
                   Volume Name: vol1
                    Qtree Name: ""
                      LUN Name: lun1
                     LUN Size: 350GB
                       OS Type: linux
             Space Reservation: enabled
                 Serial Number: 801mG?QMdRIe
           Serial Number (Hex): 3830316d473f514d64524965
                       Comment:
    Space Reservations Honored: false
              Space Allocation: disabled
                         State: online
                      LUN UUID: 39597210-bb89-44bf-ac06-c926e55c4cd0
                        Mapped: unmapped
                    Used Size: 351.4GB
    

追加情報

バグ 1211279 - LUN サイズと使用済みサイズの不整合が報告されています

 

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