At some point since upgrading from DFM to OnCommand, we have started to see informational events like these:
SnapMirror relationship from sourcefiler:/sourcevol (433) to destfiler:/destvol (2191) was undeleted.
We don't see these for every snapmirror relationship. I searched through syslog on the source and destination filers and don't see any messages about an undelete, so I'm assuming this is something internal to OnCommand.
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