We've been using vFiler DR for some time now without any issues. Recently we noticed that some of our qtrees on some new vFilers were not being discovered in Oncommand Core (5.1).

After speaking with Netapp support they highlighted that there is a known issue (no bug or KB article AFAIK) where the passive DR vFilers cause exactly the issue we are seeing. On their advice we deleted the DR vFilers from Oncommand Core via the DFM CLI. As soon as we did this the new qtrees on the vFilers were detected.

However when we flipped our vFilers from one site to another using vFiler DR:

1. Stop the active vFiler. 2. Resync the previously active to the DR vFiler. 3. Activate the DR vFiler 4. Cleanup snapmirrors and reverse snapmirror.

We found that none of the volumes on the vFilers that were activated could be seen. On checking the vFilers on DFM we could see the active vFiler and several deleted instances of the DR vFilers. When I attempted to delete the vFilers so that I could readd them I got an SQL error as they were references by views and other objects in the DFM database.

Netapp support then pointed me to this article:

https://kb.netapp.com/support/index?page=content&id=3012455

which mentions:

“With the ONTAP vFiler DR feature, it is possible to have two instances of the exact same path; one path on the active vFiler and one path on the standby vFiler.”.

The article relates to Protection Manager but the root cause is the same.

Support then mentioned that Vfiler DR appears to be incompatible with Oncommand Core.

Has anyone else experienced this or have a workaround for it?

Currently we would have to flip the vFilers, delete the vFilers, purge the database (after taking backup) and then restart the database so that it can rediscover the vFilers. This isn't workable but really don't want to go back to manually destroying and creating vFilers as it's time consuming and error prone.

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