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 .
If the new installation or upgrade fails while copying the image and you want to keep the old (existing)
Step 4
image, then copy the old image (that you saved to an external server in Step 1) to the bootflash using
either Fabric Manager or the copy command.
Step 5
If the switch fails to boot, then follow the recovery procedure described in the "Troubleshooting Installs,
Upgrades, and Reboots" section of the
Upgrading a Cisco MDS 9124 Switch
If you are upgrading from Cisco MDS SAN-OS Release 3.1(1) to Cisco SAN-OS Release 3.1(3) on a
Cisco MDS 9124 Switch, follow these guidelines:
•
•
•
•
•
•
Performing a Disruptive Upgrade on a Single Supervisor MDS Family Switch
Cisco MDS SAN-OS software upgrades are disruptive on the following single supervisor Cisco MDS
Family switches:
•
•
•
If you are performing an upgrade on one of those switches, you should follow the nondisruptive upgrade
path shown in
ensures that the binary startup configuration remains intact.
If you do not follow the upgrade path, (for example, you upgrade directly from SAN-OS Release 2.1(2b)
to SAN-OS Release 3.1(3)), the binary startup configuration is deleted because it is not compatible with
the new image, and the ASCII startup configuration file is applied when the switch comes up with the
new upgraded image. When the ASCII startup configuration file is applied, there may be errors. Because
of this, we recommend that you follow the nondisruptive upgrade 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 contains the following sections:
•
•
OL-12208-05
During the upgrade, configuration is not allowed and the fabric is expected to be stable.
The Fabric Shortest Path First (FSPF) timers must be configured to the default value of 20 seconds;
otherwise, the nondisruptive upgrade is blocked to ensure that the maximum down time for the
control plane can be 80 seconds.
If there are any CFS commits in the fabric, the nondisruptive upgrade will fail.
If there is a zone server merge in progress in the fabric, the nondisruptive upgrade will fail.
If a service terminates the nondisruptive upgrade, the show install all failure-reason command can
display the reason that the nondisruptive upgrade cannot proceed.
If there is not enough memory in the system to load the new images, the upgrade will be made
disruptive due to insufficient resources and the user will be notified in the compatibility table.
MDS 9120 switch
MDS 9140 switch
MDS 9216i switch
Table
4, even though the upgrade is disruptive. Following the nondisruptive upgrade path
General Downgrading Guidelines, page 18
Downgrading the SSI Image on Your SSM, page 20
Cisco MDS 9000 Family Release Notes for Cisco MDS SAN-OS Release 3.1(3)
Downgrading Your Cisco MDS SAN-OS Software Image
Cisco MDS 9000 Family Troubleshooting Guide, Release 3.x.
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