S e n d d o c u m e n t a t i o n c o m m e n t s t o m d s f e e d b a c k - d o c @ c i s c o . c o m
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Cisco MDS 9000 Family Release Notes for Cisco MDS NX-OS Release 5.0(4b)
OL-21012-04
Downgrading Your Cisco MDS SAN-OS Software Image
•
New Features in Cisco MDS NX-OS Release 5.0(4b), page 25
General Downgrading Guidelines
Use the following guidelines to nondisruptively
downgrade your Cisco MDS NX-OS Release 5.0(4b):
•
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.
