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ONTAPにおけるアグリゲートとボリューム使用量の容量不一致

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ontap-9
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環境

ONTAP 9

問題

  • Usedスペースについて、df -A -gがアグリゲートレベルで報告する値と、df -gがそのアグリゲートに属するボリュームごとに報告するUsedスペースの合計値との間に不一致が確認されました
  • この不一致により、ONTAP 9におけるスペース管理および実際の利用可能ストレージに関して混乱が生じました

例:
Cluster::*> df -A -g
Aggregate       total    used    avail  capacity
n1_aggr1       65112GB  16550GB 48561GB    25%
n1_aggr1/.snapshot    0GB    0GB    0GB     0%

Cluster::*> df -g
Filesystem       total    used   avail  capacity  Mounted on    Vserver
/vol/n1_aggr1_vol1/  12288GB  10919GB 1368GB   88%   ---       svm1
/vol/n1_aggr1_vol2/  10639GB  9533GB  1105GB   89%   ---       svm1
/vol/n1_aggr1_vol3/  4136GB  3107GB  1029GB   75%   ---       svm1

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