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NDMP backup is slow

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Category:
ndmp
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dp
Last Updated:

Applies to

  • ONTAP 9
  • NDMP 3-way
  • DMA (Data Management Application)
  • Performance

Issue

  • Slow backup for one of the volume backups with Backup server
  • After investigation, all NDMP 3-way backups are slow in phases 3 and 4:
Backup log:

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 speeds are fine:

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

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