Cisco MDS 9000 Family Release Notes for Cisco MDS NX-OS Release 5.0(4d) (OL-21012-06 B0, May 2011)

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Cisco MDS 9000 Family Release Notes for Cisco MDS NX-OS Release 5.0(4d)
OL-21012-06
Downgrading Your Cisco MDS SAN-OS Software Image
• New Features in Cisco MDS NX-OS Release 5.0(4d), page 26
General Downgrading Guidelines
Use the following guidelines to nondisruptively downgrade your Cisco MDS NX-OS Release 5.0(4d):
• Install and configure dual supervisor modules.
• Issue the system no acl-adjacency-sharing execute command to disable ACL adjacency usage on
Generation 2 and Generation 1 modules. If this command fails, reduce the number of zones, IVR
zones, TE ports, or a combination of these in the system and issue the command again.
• Disable all features not supported by the downgrade release. Use the show incompatibility system
downgrade-image command to determine what you need to disable.
• Use the show install all impact downgrade-image command to determine if your downgrade will
be nondisruptive.
• Be aware that some features impact whether a downgrade is disruptive or nondisruptive:
– 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.
– SSM: Intelligent services traffic on the SSM, such as SANTap, NASB, and FC write
acceleration, is disrupted during a downgrade. SSM Fibre Channel traffic is not.
– Gigabit Ethernet Ports: Traffic on Gigabit Ethernet ports is disrupted during a downgrade.
This includes IPS modules and the Gigabit Ethernet ports on the MPS-14/2 module, 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.
– IVR: With IVR enabled, you must follow additional steps if you are downgrading from Cisco
SAN-OS Release 2.1.(1a), 2.1(1b), or 2.1.(2a). See the “Upgrading with IVR Enabled” section
on page 19 for these instructions.
– FICON: If you have FICON enabled, the downgrade path is different. See the “FICON
Downgrade Paths” section on page 25.
Note A downgrade from NX-OS Release 4.2(1b) to SAN-OS Release 3.3(1x) is not supported on MDS
switches, when FC-Redirect based applications, such as Data Mobility Manager or Storage Media
Encryption, are configured in the fabric if either of the following conditions are satisfied:
1. A target for which FC-Redirect is configured is connected locally and there are Generation 1
modules with ISLs configured in the switch.
2. A host, for which FC-redirect is configured, is connected locally on a Generation 1 module.
If these conditions exist, remove the application configuration for these targets and hosts before
proceeding with the downgrade.
Use Table 14 to determine the nondisruptive downgrade path from Cisco NX-OS Release 4.2(1b). Find
the SAN-OS image you want to downgrade to in the To SAN-OS Release column of the table and use
the path recommended.