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FlexGroup内のディレクトリ間でのファイル移動に時間がかかる

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Category:
ontap-9
Specialty:
perf<a>2009792328</a>
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環境

  • ONTAP 9
  • FlexGroup

問題

  • FlexGroupでパフォーマンスが低下している。
  • ファイルの移動には数分から数時間かかります。
    • 例: ファイル名の変更にかかる時間は、午後5時46分から翌朝12時13分です。
      • [2023-10-10 17:46:29,751] {bash_operator.py:126} INFO - 2023.10.10D22:46:29.751918000 [info][0] Moving :/mnt/home/dir1/dir2/dir3/dir4/dir5/dir6/dir7/dir8$/file1_lastModified -> :/mnt/home/dir1/dir2/dir3/dir4/dir5/dir6/dir7/dir/lastModified [2023-10-11 00:13:48,255] {bash_operator.py:126} INFO - 2023.10.11D05:13:48.255446000 [info][0] Executed successfully
    • 高レイテンシは qos statistics volume latency show
      • Cluster::> qos statistics volume latency show -vol vol1 -vserver svm1 Workload ID Latency Network Cluster Data Disk QoS Max QoS Min NVRAM Cloud FlexCache SM Sync VA AVSCAN --------------- ------ ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- -total- - 8.58ms 2.99ms 247.00us 5.32ms 2.00us 0ms 0ms 28.00us 0ms 0ms 0ms 0ms 0ms fg1-wid50693 50693 35.39s 16.59s 628.87ms 18.18s 0ms 0ms 0ms 1.80ms 0ms 0ms 0ms 0ms 0ms
    • NFSリプレイキャッシュの巻き戻し回数が多く(数分で数百万回)、上記のネットワーク処理レイテンシが高くなる原因となっています。

      • Cluster::> set -privilege diagnostic; statistics start -object rw_ctx -counter nfs_rewinds (wait 5 minutes) Cluster::*> statistics show Object: rw_ctx Instance: rw_ctx Start-time: 10/25/2023 15:18:01 End-time: 10/25/2023 15:22:44 Elapsed-time: 283s Scope: node2 Counter Value -------------------------------- -------------------------------- nfs_rewinds - Credentials 0 ... Replay Cache 12697850 <--- ... Cluster::*> statistics stop

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