Cisco MDS 9000 Family Release Notes for Cisco MDS NX-OS Release 6.2(3) (OL-29201-02, August 2, 2013)

Cisco MDS 9000 Family Release Notes for Cisco MDS NX-OS Release 6.2(3)

OL-29201-02

Downgrading Your Cisco MDS SAN-OS Software Image

Use Table 17 to determine the nondisruptive upgrade path for FICON-certified releases. Find the image

release number you are currently using in the Current Release with FICON Enabled column of the table

and follow the recommended path.

Downgrading Your Cisco MDS SAN-OS Software Image

This section lists the guidelines recommended for downgrading your Cisco MDS SAN-OS software

image and includes the following topics:

• General Downgrading Guidelines, page 20

• FICON Downgrade Paths, page 22

General Downgrading Guidelines

Follow these general guidelines before you perform a a software downgrade:

• 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 18 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.

Table 17 FICON Nondisruptive Upgrade Path

Current Release with FICON

Enabled Upgrade Path

NX-OS Release 4.2(7b) You can nondisruptively upgrade directly to NX-OS Release 5.2(2).

NX-OS Release 4.2(1b) You can nondisruptively upgrade directly to NX-OS Release 4.2(7b).

NX-OS Release 4.1(1c) You can nondisruptively upgrade directly to NX-OS Release 4.2(1b).

SAN-OS Release 3.3(1c) You can nondisruptively upgrade directly to NX-OS Release 4.2(1b).

SAN-OS Release 3.2(2c),

3.0(3b), 3.0(3), and 3.0(2).

First upgrade to SAN-OS Release 3.3(1c), and then upgrade to NX-OS

Release 4.2(1b).