Cisco MDS 9000 Family Release Notes for Cisco MDS NX-OS Release 4.1(1b) (OL-17675-02, October 2008)

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Cisco MDS 9000 Family Release Notes for Cisco MDS NX-OS Release 4.1(1b)
OL-17675-02
Downgrading Your Cisco MDS SAN-OS Software Image
Although the switch indicates that the bootflash check takes 30 minutes, it typically completes in
just a few seconds.
Once the bootflash check is complete on both the active and the standby supervisors, proceed with
the downgrade process.
Note The system health check bootflash command is available starting in NX-OS 4.1(1b).
Downgrading the SSI Image on Your SSM
Use the following guidelines when downgrading your SSI image on your SSM:
• On a system with at least one SSM installed, the install all command might fail on an SSM when
you downgrade from Cisco NX-OS Release 4.1 to any SAN-OS 2.x release earlier than SAN-OS
Release 2.1(2e). Power down the SSM and perform the downgrade. Bring up the SSM with the new
bootvar set to the 2.x SSI image.
• Downgrade the SSI boot images on the SSMs on the switch to a release version supported by your
Cisco SAN-OS release. Refer to the Cisco MDS SAN-OS Release Compatibility Matrix for Storage
Service Interface Images.
• SSM intelligent services traffic switching on SSM ports is disrupted on upgrades or downgrades.
• Fibre Channel switching traffic on SSM ports is not disrupted under the following conditions:
– All SSM applications are disabled. Use the show ssm provisioning command to determine if
any applications are provisioned on the SSM. Use the no ssm enable feature configuration
mode command to disable these features.
– The EPLD version on the SSM is at 0x07 or higher. Use the show version module slot epld
command to determine your EPLD version. Refer to the Cisco MDS 9000 Family Release Notes
for Cisco MDS 9000 EPLD Images to upgrade your EPLD image.
– Refer to the Cisco MDS 9000 Family Interoperability Support Matrix and the “Managing
Modules” chapter in the Cisco MDS 9000 Family CLI Configuration Guide, Release 3.x, for
information on downgrading your SSM.