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Ndmp backup using Avamar failing with magic number 79ea0000

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ndmp
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dp
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Applies to

  • 9.16.1P2 CLUSTER-MODE
  • NDMP
  • AVAMAR
  • Data Domain

Issue

  • Avamar backup failing with the following error :
avtar FATAL : Invalid stream format: magic number 79ea0000 (stream offset = 1024)"
  • Ndmp logs showing DMA closing the connection for an unknown reason :
000001a.008edb6c 053fa72c Tue Jun 17 2025 09:23:32 +02:00 [kern_ndmpd:info:7801] [29635]  DEBUG: DMA>>S V4 sequence=15 (0xf)
0000001a.008edb6d 053fa72c Tue Jun 17 2025 09:23:32 +02:00 [kern_ndmpd:info:7801] [29635]  DEBUG:      Time_stamp=0x685117f4 (Jun 17 09:23:32 2025)
0000001a.008edb6e 053fa72c Tue Jun 17 2025 09:23:32 +02:00 [kern_ndmpd:info:7801] [29635]  DEBUG:      message type=0 (NDMP4_MESSAGE_REQUEST)
0000001a.008edb6f 053fa72c Tue Jun 17 2025 09:23:32 +02:00 [kern_ndmpd:info:7801] [29635]  DEBUG:      message_code=0x403 (NDMP4_DATA_ABORT)
0000001a.008edb70 053fa72c Tue Jun 17 2025 09:23:32 +02:00 [kern_ndmpd:info:7801] [29635]  DEBUG:      reply_sequence=29 (0x1d)
0000001a.008edb71 053fa72c Tue Jun 17 2025 09:23:32 +02:00 [kern_ndmpd:info:7801] [29635]  DEBUG:      error_code=0 (NDMP4_NO_ERR)
  • Backup logs showing dump fail 10s into phase III when writing the dir structure with the following error :
(Write DIRNET for BKP ID=14, type=3 interrupted while at waiting for max inflight. Error = Broken pipe.)
dmp Tue Apr 22 10:20:00 CEST 2025 /SVM01/vol1/(0) Error (Write to socket failed)

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