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Qfabric NSSU upgrade from 12.2X50 to 13.1X50,13.2X52 and 14.1X53 or later NOT recommended

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Article ID: TSB16842 TECHNICAL_BULLETINS Last Updated: 18 Nov 2015Version: 1.0
Alert Type:
PSN - Product Support Notification
Alert Description:
 Qfabric NSSU upgrade from 12.2X50 to 13.1X50,13.2X52 and 14.1X53 or later NOT recommended
Solution:
 
This bulletin is to notify that Qfabric NSSU upgrade from 12.2X50 to 13.1X50,13.2X52 and 14.1X53 or later NOT recommended.


12.2X50 branch is susceptible to NSSU upgrade failures due to:
  • Several Database related issues which may be persistent across 12.2 releases.
  • Persistent nature of above issues and any additional steps during network operations leading the system to go into inconsistent state may cause unpredictable behaviour during NSSU upgrade.

Below are some PRs which are applicable to 12.2X50 and may cause issues with NSSU upgrade.

PR 957442: Qfabric TrimSyslogFiles stored procedure is NOT purging syslog records as expected
PR 957436: Qfabric Javadaemon need to cleanup temporary file system DB once MySQL DB becomes available
PR 829248: Qfabric Director Group stuck in CPU loop
PR 963841: On a QFabric system, if netcored.log and loggerd.log files in /var/log/kdm consume all the space in Diagnostic Routing Engine (DRE), Non-stop Software Upgrade (NSSU) might fail in DRE.
PR 877400: Qfabric ccif-client cores may be seen during NSSU

It is recommended to use alternate methods ( normal upgrade or USB install and temporarily migrate traffic from Qfabric ) to upgrade the Qfabric running 12.2X50.

Implementation:
 

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