H3C Switch Software Upgrade Guide-6W101

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02-Upgrade restrictions and guidelines
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Upgrade restrictions and guidelines

Unless otherwise noted, this document uses a standalone device to describe the upgrade procedures.

Hardware-related restrictions and guidelines

·     Before the upgrade, make sure the device is operating correctly, and make sure the LEDs of the power supply, fans, cards, and subcards are normal.

·     During the upgrade, do not power off the device, and do not restart or remove swappable modules.

·     If you store the startup software images in a hot swappable storage medium, do not remove the hot swappable storage medium during the startup process.

·     Read the release notes to verify the software and hardware compatibility and hardware restrictions for the device, cards, and subcards.

Software-related restrictions and guidelines

·     Before the upgrade:

¡     Back up the current software images, configuration files, and login passwords to prevent data loss if the storage medium is damaged.

¡     Make sure the device has sufficient storage space for the upgrade software images.

¡     Make sure the CPU usage of the device or a card is not high.

¡     Enable logging of the terminal to collect information.

¡     An upgrade requiring a device reboot will cause service interruption for the duration of the reboot.

¡     Use the release notes (software feature changes) to identify the differences between the new and old commands. Some functions might become unavailable due to command changes.

¡     Use the release notes to verify that the current software version can be upgraded to the target version.

·     The upgrade of the BootWare might cause the software version to fail to be downgraded.

·     The command output varies by device model.

·     After the upgrade, do not delete the running software images.

·     Before an upgrade operation is completed, no other upgrade operations can be performed. Upgrade operations include the install, issu, and boot-loader commands.

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