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CONTAP-347687: Snapshots created with logical-snap-id=0

  1. Last updated
    Mar 6, 2025
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Category:
ontap-9
Specialty:
core
Last Updated:
3/6/2025, 7:57:22 PM

Issue

ONTAP Snapshots consist of a logical and a physical snapshot ID, both of which should not be zero.
Existing Snapshots show a logical-snapshot-id=0:

:*> snapshot show MyVolume -fields logical-snap-id,physical-snap-id
vserver volume snapshot physical-snap-id logical-snap-id
------- ------------------- ---------------------- ---------------- ---------------
MySVM MyVolume weekly.2024-11-17_0010 959 959
MySVM MyVolume daily.2024-11-23_0010 128 0 <--
MySVM MyVolume daily.2024-11-24_0010 160 0 <--
MySVM MyVolume weekly.2024-11-24_0010 161 0 <--
MySVM MyVolume daily.2024-11-25_0010 193 0 <--
MySVM MyVolume daily.2024-11-26_0010 225 0 <--
MySVM MyVolume daily.2024-11-27_0010 247 247
MySVM MyVolume daily.2024-11-28_0010 257 257
MySVM MyVolume hourly.2024-11-28_1010 261 261
MySVM MyVolume hourly.2024-11-28_1210 262 262
MySVM MyVolume hourly.2024-11-28_1410 263 263
MySVM MyVolume hourly.2024-11-28_1610 264 264
MySVM MyVolume hourly.2024-11-28_1810 265 265
MySVM MyVolume hourly.2024-11-28_2010 266 266
MySVM MyVolume daily.2024-11-29_0010 267 267
MySVM MyVolume hourly.2024-11-29_0810 268 268
MySVM MyVolume snapmirror.6c59f555-4258-11e4-b994-123478563412_2150131812.2024-11-29_084828 269 269
17 entries were displayed.

Such Snapshots existing on a snapmirror source volume, can cause snapmirror to fail with errors similar to:

Tue Nov 29 14:21:26 CET 2024 ResumedUpdate[Nov 29 13:55:00]:afcb7ffc-b3f6-11e7-9d04-00a098202a0c Operation-Uuid=7e3c5d99-10ca-428f-a5b1-d40846acd50f Group=none Operation-Cookie=0 action=Defer source=MySVM:MyVolume destination=dr_MySVM:dr_MyVolume status=Failure message=Failed to start transfer for Snapshot copy "snapmirror.6c59f555-4258-11e4-b994-123478563412_2150131812.2024-11-29_084828".(Failed to start transfer.(Snapshot access error(Replication engine error)))

 

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