Cisco MDS 9000 Family Release Notes for Cisco MDS NX-OS Release 5.2(2) (OL-25090-02 F0, January 2012)

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Cisco MDS 9000 Family Release Notes for Cisco MDS NX-OS Release 5.2(2)
OL-25090-02
Downgrading Your Cisco MDS SAN-OS Software Image
– Fibre Channel Ports: Fibre Channel ports can be nondisruptively downgraded without
affecting traffic on the ports. See Table 14 for the nondisruptive downgrade path for all SAN-OS
releases.
– Gigabit Ethernet Ports: Traffic on Gigabit Ethernet ports is disrupted during a downgrade.
This includes IPS modules and the Gigabit Ethernet ports on the MSM-18/4 module, and the
MDS 9222i switch. Those nodes that are members of VSANs traversing an FCIP ISL are
impacted, and a fabric reconfiguration occurs. iSCSI initiators connected to the Gigabit
Ethernet ports lose connectivity to iSCSI targets while the downgrade is in progress.
– FICON: If you have FICON enabled, the downgrade path is different. See the “FICON
Downgrade Paths” section on page 22.
Use Table 14 to determine the nondisruptive downgrade path from Cisco NX-OS Release 5.2(2). Find
the NX-OS or SAN-OS image that you want to downgrade to in the “To SAN-OS Release” column of
the table and follow the steps in the order specified to perform the downgrade.
Note The software downgrade information in Table 14 applies only to Fibre Channel switching traffic.
Downgrading system software disrupts IP and intelligent services traffic.