Ndmp 目录/文件恢复吞吐量与备份相比要慢很多

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Category:: ndmp

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适用场景

ONTAP 9
NDMP
远程备份

问题描述

NDMP 恢复在第 3 阶段显示大量 PAUZE 和 SEEK

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

数据包跟踪分析显示 NDMP 服务器报告的数据连接上 TCP 零窗口数量过多

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