NDMPバックアップが遅い

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環境

ONTAP 9
NDMP
DMA（Data Management Application）
パフォーマンス

問題

Backup serverを使用したボリュームバックアップの1つでバックアップが低速化
調査の結果、フェーズ3と4ですべてのNDMPバックアップが低速化していることがわかりました：

バックアップログ:

Mon Jul 26 18:00:53 SAST 202 /<vserver>/Abrasives/(4) Log_msg (Phase 3 throughput (MB sec): read 1 write 5 Mon Jul 26 18:00:53 SAST 202 /<vserver>/Abrasives/(4) Log_msg (Phase 4 throughput (MB sec): read 0 write 3 Mon Jul 26 18:01:49 SAST 202 /<vserver>/Tech_and_Spec/(2) Log_msg (Phase 3 throughput (MB sec): read 3 write 6 Mon Jul 26 18:01:49 SAST 202 /<vserver>/Tech_and_Spec/(2) Log_msg (Phase 4 throughput (MB sec): read 2 write 3 Mon Jul 26 18:02:31 SAST 202 /<vserver>/R_and_D/(3) Log_msg (Phase 3 throughput (MB sec): read 4 write 8 Mon Jul 26 18:02:31 SAST 202 /<vserver>/R_and_D/(3) Log_msg (Phase 4 throughput (MB sec): read 2 write 3 Mon Jul 26 19:22:51 SAST 202 /<vserver>/Home/(1) Log_msg (Phase 3 throughput (MB sec): read 1 write 6 Mon Jul 26 19:22:51 SAST 202 /<vserver>/Home/(1) Log_msg (Phase 4 throughput (MB sec): read 3 write 3 Tue Jul 27 18:00:53 SAST 202 /<vserver>/Abrasives/(3) Log_msg (Phase 3 throughput (MB sec): read 1 write 7 Tue Jul 27 18:00:53 SAST 202 /<vserver>/Abrasives/(3) Log_msg (Phase 4 throughput (MB sec): read 0 write 3 Tue Jul 27 18:02:40 SAST 202 /<vserver>/R_and_D/(4) Log_msg (Phase 3 throughput (MB sec): read 4 write 8 Tue Jul 27 18:02:40 SAST 202 /<vserver>/R_and_D/(4) Log_msg (Phase 4 throughput (MB sec): read 2 write 3 Tue Jul 27 18:07:27 SAST 202 /<vserver>/Tech_and_Spec/(2) Log_msg (Phase 3 throughput (MB sec): read 6 write 11 Tue Jul 27 18:07:27 SAST 202 /<vserver>/Tech_and_Spec/(2) Log_msg (Phase 4 throughput (MB sec): read 3 write 3 Tue Jul 27 19:38:01 SAST 202 /<vserver>/Home/(1) Log_msg (Phase 3 throughput (MB sec): read 1 write 6 Tue Jul 27 19:38:01 SAST 202 /<vserver>/Home/(1) Log_msg (Phase 4 throughput (MB sec): read 3 write 3

Dump to Null 速度は問題ありません：

Tue Jul 27 16:42:09 SAST 202 /vol/Data/(1) Log_msg (Phase 3 throughput (MB sec): read 22 write 39 Tue Jul 27 16:42:09 SAST 202 /vol/Data/(1) Log_msg (Phase 4 throughput (MB sec): read 241 write 241