Users Guide

56 Fabric OS Troubleshooting and Diagnostics Guide
53-1002930-01
USB error handling
5
USB error handling
Table 11 outlines how the USB device handles errors under specific scenarios and details what
actions you should take after the error occurs.
Considerations for downgrading firmware
The pre-installation check of the firmwareDownload command detects all of the blocking
conditions that can prevent a successful downgrade, and warns you about all these conditions. The
error messages displayed by the firmwareDownload command states the blocking conditions and
the corresponding commands to correct them. You must address all of these blocking conditions
before proceeding. Refer to the Fabric OS Administrator’s Guide for more information regarding
individual features and commands.
To avoid failure of a firmware downgrade, verify the firmware you are downgrading to supports all
the blades in the chassis, and that the switch, blades, or chassis supports all the features you are
currently using. If not, you must disable or remove those features that are not supported.
Preinstallation messages
The system messages in this section are displayed if an exception is encountered during firmware
download. The following examples show feature-related messages that you may see if you were
upgrading from Fabric OS v7.1.0 to v7.2.0:
NOTE
The system messages in this section are for illustration purposes only. They do not represent the
entire range of possible error messages appropriate to a wide variety of installation scenarios.
Upgrade to 7.2 will set default QoS port configuration from AE to OFF.
Cannot upgrade directly to 7.2. Please upgrade to 7.0 first and then upgrade
to 7.2.
Upgrade to 7.2 is not allowed because FC Fastwrite is not supported on this
version. Please use "fastwritecfg" to deconfigure FC Fastwrite for all slots
and try again.
Upgrade to 7.2 is not allowed due to the presence of ioddelay configuration.
Please reset the feature with "ioddelayreset" before upgrading to v7.1.
TABLE 11 USB error handling
Scenario under which download fails Error handling Action
An access error occurs during
firmware download because the
removal of the USB device, or USB
device hardware failure, and so
on.
Firmware download times out and
commit is started to repair the
partitions of the CPUs that are
affected.
None.
USB device is not enabled. Firmware download fails with an error
message
Enable the USB device using the
usbStorage -e command and retry
firmware download.