> # Downgrading with SDV LUN Zoning Configured

> The following are downgrade scenarios when SDV LUN zoning is configured:

> - Real initiator and SDV virtual target with LUN
> - SDV virtual initiator and real target with LUN
> - SDV virtual initiator and SDV virtual target with LUN

> In each of these cases, a configuration check is registered to prevent users from downgrading to SAN-OS Release 3.1(2). This incompatibility will be disruptive if you proceed with the downgrade.

> To avoid the configuration check, delete all the LUN zone members from SDV zones, and then activate the zone set before the downgrade.

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