QFX10k Storage Issues During Upgrade from 17.x-S6 to 20.4x or Later: A Comprehensive Analysis

The QFX10k series of switches from Juniper Networks are known for their high-performance and reliability in data center and cloud environments. However, during the upgrade process from 17.x-S6 to 20.4x or later, some users have reported storage issues that can impact the overall performance and stability of the switch. In this article, we will delve into the details of these storage issues, their causes, and potential solutions.

Understanding the QFX10k Storage Architecture

The QFX10k series of switches use a distributed storage architecture, where each line card has its own storage module. This architecture provides high-performance and redundancy, but it also introduces complexity when it comes to managing storage during upgrades.

The storage module on each line card is responsible for storing the Junos OS, configuration files, and other critical data. The storage module is typically divided into multiple partitions, each with its own specific function. The main partitions are:

• / (root partition): This is the primary partition that contains the Junos OS and configuration files.
• /var (var partition): This partition stores log files, temporary files, and other data that is not critical to the operation of the switch.
• /config (config partition): This partition stores the configuration files for the switch.

Causes of Storage Issues During Upgrade

During the upgrade process from 17.x-S6 to 20.4x or later, several factors can contribute to storage issues on the QFX10k series of switches. Some of the common causes include:

• Insufficient Storage Space: If the storage module on the line card does not have sufficient space to accommodate the new Junos OS and configuration files, it can lead to storage issues.
• Corrupted Partitions: Corruption in the partitions can prevent the switch from booting up properly or cause other storage-related issues.
• Incompatible Storage Module: If the storage module on the line card is not compatible with the new Junos OS, it can cause storage issues.
• Incorrect Upgrade Procedure: If the upgrade procedure is not followed correctly, it can lead to storage issues.

Symptoms of Storage Issues During Upgrade

The symptoms of storage issues during the upgrade process can vary depending on the specific cause of the issue. Some common symptoms include:

• Switch Fails to Boot Up: If the storage module is corrupted or there is insufficient storage space, the switch may fail to boot up properly.
• Error Messages: Error messages such as “No space left on device” or “Corrupted partition” may appear during the upgrade process.
• Upgrade Failure: The upgrade process may fail due to storage issues, leaving the switch in an inconsistent state.

Troubleshooting Storage Issues During Upgrade

Troubleshooting storage issues during the upgrade process requires a systematic approach. Here are some steps that can be taken:

• Verify Storage Space: Verify that the storage module on the line card has sufficient space to accommodate the new Junos OS and configuration files.
• Check for Corrupted Partitions: Check the partitions for corruption and repair or replace them as needed.
• Verify Storage Module Compatibility: Verify that the storage module on the line card is compatible with the new Junos OS.
• Review Upgrade Procedure: Review the upgrade procedure to ensure that it was followed correctly.

Solutions to Storage Issues During Upgrade

The solutions to storage issues during the upgrade process depend on the specific cause of the issue. Here are some potential solutions:

• Free Up Storage Space: Free up storage space on the line card by deleting unnecessary files or expanding the storage module.
• Repair or Replace Corrupted Partitions: Repair or replace corrupted partitions to ensure that the switch can boot up properly.
• Upgrade Storage Module: Upgrade the storage module on the line card to a compatible version.
• Rerun Upgrade Procedure: Rerun the upgrade procedure to ensure that it is completed successfully.

Best Practices for Upgrading QFX10k Switches

To avoid storage issues during the upgrade process, it is recommended to follow best practices such as:

• Verify Storage Space: Verify that the storage module on the line card has sufficient space to accommodate the new Junos OS and configuration files.
• Backup Configuration Files: Backup configuration files to ensure that they can be restored in case of an issue.
• Test Upgrade Procedure: Test the upgrade procedure in a lab environment before applying it to production switches.
• Monitor Switch Performance: Monitor switch performance during the upgrade process to detect any potential issues.

Conclusion

Storage issues during the upgrade process from 17.x-S6 to 20.4x or later on QFX10k switches can be complex and challenging to resolve. However, by understanding the causes of these issues and following best practices, network administrators can minimize the risk of storage issues and ensure a successful upgrade. It is also important to have a comprehensive troubleshooting plan in place to quickly identify and resolve any issues that may arise during the upgrade process.