Ndmp directory/file restore a lot slower throughput compared to backup

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Views:: 107

Visibility:: Public

Votes:: 0

Category:: ndmp

Specialty:: dp

Last Updated:

Applies to

ONTAP 9
NDMP
Remote Backup

Issue

NDMP restore showing a lot of PAUZE and SEEK during phase 3

00000030.4d4bbea1 04895587 Mon Feb 17 2025 11:30:31 +01:00 [kern_ndmpd:info:7671] [15354] INFO: DATA notification state 3 (SESS_STATE: PAUSED) event 8 (EVENT: SEEK)

00000030.4d4bbea2 04895587 Mon Feb 17 2025 11:30:31 +01:00 [kern_ndmpd:info:7671] [15354] INFO: DATA read at offset 17856332800 with length 2621440

00000030.4d4bbea3 04895587 Mon Feb 17 2025 11:30:32 +01:00 [kern_ndmpd:info:7671] [15354] INFO: DATA notification state 3 (SESS_STATE: PAUSED) event 8 (EVENT: SEEK)

00000030.4d4bbea4 04895587 Mon Feb 17 2025 11:30:32 +01:00 [kern_ndmpd:info:7671] [15354] INFO: DATA read at offset 17858954240 with length 2621440

Packet trace analysis showing an excessive numbers of TCP zero window on the data connection reported from NDMP server

2021393    3422.740198    0.000134000    Apr  2, 2025 09:25:06.797802000 W. Europe Daylight Time    10.xxx.xxx.xxx    172.xxx.xxx.xxx    40602    1169539381    29056            1169579917    1626325338    [TCP Window Full]  | Unknown (0x90f5)[Packet size limited during capture]



2021394    3422.740224    0.000026000    Apr  2, 2025 09:25:06.797828000 W. Europe Daylight Time    172.xxx.xxx.xxx    10.xxx.xxx.xxx    66    1626325338    0    2021393    0.000026000    1626325338    1169579917    [TCP ZeroWindow] 10843 → 4588 [ACK] Seq=1626325338 Ack=1169579917 Win=0 Len=0 TSval=2981828353 TSecr=3309102012