E-Series: How to troubleshoot Volume Not On Preferred Path event
Applies to
- NetApp E-Series
- Volume Not On Preferred Path (VNOPP)
Description
- Volume Not On Preferred Path (VNOPP) is a condition that is observed on the storage in the Recovery Guru and in the Major Event Log (
Event Type 4011). - This condition is reported when a volume, or multiple volumes are owned by their non-preferred controller for a period of time that exceeds the Failover Alert Delay timer (default 5 minutes).
- VNOPP is commonly caused by, but not limited to, any of the following:
- Controller reboot (example: PANIC, manual reset, Ancient IO, WDTO).
- Non-existent connection to a volume's owning controller.
- Misconfigured host mappings.
- Break in connection/instability in the SAN between a Host and the owning controller (example: Bad cable, bad SFP, bad HBA port, switch port bounce).
- Improperly configured SAN Host multipath.
- Unstable or misbehaving array controller.
- This article provides a systematic approach to identify what caused a VNOPP, fix the underlying issue (if necessary), and reassign the volume(s) back to their preferred owner.
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WARNING Do not upgrade controller firmware to try to fix volumes not on preferred path issue. Upgrading while the system is not stable can result in unpredictable behavior including outages. |