In this section:

Caution
The DSC should never be left in a partially upgraded state. If the upgrade cannot be completed, a rollback should be performed.  Changes should NEVER be made in the DSC while it is in a partially upgraded state.

In the event the upgrade is performed via ssh to the DSC management CPU and a loss of connection is suffered while the CPU upgrade is in progress, you may continue the upgrade after reconnecting.

Restart the Upgrade

To restart an in progress upgrade after connection loss, reconnect to the direct IP of the management CPU the upgrade was initially started from and issue the 'upgrade' command again.

Always select option A (Continue that upgrade process using the same backup) as seen in the example below.  Never select option B unless directed to do so by Customer Support.


When continuing a previous upgrade, some differences occur, as shown below:

:::::::::::::::::::::::::::::::: Ribbon DSC ::::::::::::::::::::::::::::::::
                            ┌───────────────────┐
                            │DSC8000 CPU Upgrade│
                            └───────────────────┘
_____________________________________________
Type "q" to quit from most prompts or CTRL-C.


      ┌────────────────────────Warning────────────────────────┐
      │Found a previous upgrade in progress. You can:          │
      │ a) Continue that upgrade process using the same backup │
      │or                                                      │
      │ b) Restart using new backup.                           │
      │Both options will skip any already upgraded peers.      │
      └────────────────────────────────────────────────────────┘
Please type 'continue' or 'restart' accordingly:

The preupgrade check printout will change to:

-----------------------------Pre Upgrade Check------------------------------
Recent preupgrade check found and all tests passed.
Continuing with upgrade.

And the backup printout will change to:

-------------------------------System Backup--------------------------------
Generating new backup...Skipped - Using Lab230slot13-bak-29-09-20-151631-Complete-DSC8000.18.1.0.tar.gz

Roll Back a Partial Upgrade

If the loss of connection is not resolved with sufficient time left in the maintenance window to complete the upgrade, you will need to rollback from the newly upgraded management CPU.

Caution

Rolling back from a partial upgrade must be completed as soon as connection can be restored to the DSC.  No changes should be made on the DSC while in a partially upgraded state.

One of the two management CPUs will ALWAYS be the first card upgraded.  You will need to ssh to that CPU's direct IP and follow the rollback procedure for CPUs found here: DSC 8000 Software Rollback

If connection is lost during the upgrade of Switches or IO cards, if the software application verification fails, or the cards demonstrate issues, follow the rollback procedures found in the guide for the affected card(s).

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