Users Guide

Fabric OS Troubleshooting and Diagnostics Guide 59
53-1002930-01
Considerations for downgrading firmware
5
Blade types
Where blades are incompatible with a firmware download, they must be removed or powered off
before a firmware download begins, as noted in the following message.
Message The FC10-6 (type 39) blade is not supported by the target firmware. Please use slotshow to find out
which slot it is in and remove it first.
Probable cause and recommended action
The firmware download operation was attempting to upgrade a system to Fabric OS v7.2.0 with one
or more of the Brocade FC10-6 blades (blade ID 39) in the system. The Brocade FC10-6 blades are
not supported on firmware v7.2.0, so the firmware download operation failed.
Use the slotShow command to display which slots the Brocade FC10-6 blades occupy. Physically
remove the blades from the chassis, or use the micro-switch to turn the blade off. Retry the
firmware download operation.
Firmware versions
The system messages in this section refer to differences between the current firmware and the
firmware you are applying to the switch.
ATTENTION
Brocade does not support upgrades from more than one previous release. For example, upgrading
from Fabric OS v7.1.0 to v7.2.0 is supported, but upgrading from Fabric OS v7.0.0 or a previous
release directly to v7.2.0 is not. In other words, upgrading a switch from Fabric OS v7.0.0 to v7.2.0
is a two-step process: first upgrade to v7.1.0, and then upgrade to v7.2.0. If you are running a
pre-Fabric OS v6.2.0 version, first you must upgrade to v6.2.0, then to v6.3.0, then to v6.4.0, then
to v7.0.0, then to v7.1.0, and finally to v7.2.0.
Message Cannot upgrade directly to v7.2.0. Upgrade your switch to v7.1.0 first before upgrading to the
requested version.
Probable cause and recommended action
If the switch is running v7.0.0 or earlier, you are not allowed to upgrade directly to v7.2.0 because
of the “two-version” rule.
Upgrade your switch to Fabric OS version v7.1.0 before upgrading to v7.2.0
Message Non-disruptive firmwaredownload is not supported when downgrading to 7.0. Please use
firmwaredownload -s to download the 7.0 firmware.
Probable cause and recommended action
If the switch is running v7.2.0, you are not allowed to downgrade directly to v7.0.x without causing
disruption to your fabric.
Downgrade using the firmwareDownload -s command.