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CFDISK-1300: ディスクモデル X4014TCM5V15TNTE 高レイテンシ

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問題

ディスクモデルX4014TCM5V15TNTE(Kioxia)ドライブでは、読み取りおよび書き込みIOレイテンシが大幅に増加していることが報告されています。レイテンシの増加は、ONTAPを9.12.1P11から9.14.1P12にアップグレードした後に発生しました。

ツール statit を使用してドライブのパフォーマンスを確認します。

Cluster::> set diag
Cluster::*> run -node node1 -command statit -b
Wait for about 60 seconds
Cluster::*> run -node node1 -command statit -e

出力でモデル X4014TCM5V15TNTE のディスクを探し、書き込み遅延を確認します。
disk        ut%  xfers  ureads--chain-usecs writes--chain-usecs cpreads-chain-usecs greads--chain-usecs gwrites-chain-usecs
/aggr-data/plex0/rg0:
<snip>
0n.9        94 7743.02  4644.50   2.19   789 1275.55   3.53  2905 1822.96   2.00   704   0.00   ....    .   0.00   ....    .
0n.16        15 7754.81  4656.91   2.20   44 1275.86   3.55   19 1822.03   1.99   56   0.00   ....    .   0.00   ....    .
0n.17        94 7751.88  4660.64   2.19   788 1273.52   3.56  2881 1817.72   2.00   707   0.00   ....    .   0.00   ....    .
0n.19        93 7763.13  4669.08   2.18   775 1270.86   3.54  2874 1823.19   1.99   697   0.00   ....    .   0.00   ....    .
0n.6        26 7743.62  4644.19   2.19   132 1276.99   3.55   66 1822.44   2.00   223   0.00   ....    .   0.00   ....    .
<snip>

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