vdx 6740 firmware upgrade fails - ISSU is not supported to the target firmware version

[Pawel_Eljasz]

hi gents,

I have two vdx in logical chassis. I'm trying to upgrade 7.2.0a1 to nos7.3.0aa but process fails.
Is this upgrade path not supported or I'm having a problem?
I'm hoping non-disruptive upgrade is possible with ISSU or some other way.

code:

bottom# firmware download logical-chassis ftp host 10.214.234.2 user anonymous directory / rbridge-id 1-2
Password: *********

Following is the result of the sanity check on the specified nodes.

Rbridge-id    Sanity Result           Current Version               
--------------------------------------------------------------
1             Failed *                7.2.0a1
2             Failed *                7.2.0a1

* Details:
Rbridge-id 1:

ISSU is not supported to the target firmware version. Please specify coldboot option in the command-line for download.

The preinstall script failed.

Rbridge-id 2:

ISSU is not supported to the target firmware version. Please specify coldboot option in the command-line for download.

The preinstall script failed.

Firmware download failed. Please address the failures and then initiate firmware download again.

[Pawel_Eljasz]

This does not look good. It looks like "stack" lost configuration, lost Vlans, probably everything.
How to troubleshoot this and how to fix!?

many thanks.

[Yulia_Abitbul]

Yes, schema mismatch means that switches are on different version codes and RB2 is waiting for RB1 to be upgraded

[Pawel_Eljasz]

I followed the advice, upgraded only one switch and I now see:

code:

2019/01/30-12:21:03, [VCS-1006], 3978, SW/0 | Active, ERROR, VDX6740, Event: VCS node rejoin, Coordinator IP: 10.214.234.95, VCS ID: 1,
 Status: rBridge ID 2 (10.214.234.91) failed to rejoin VCS cluster, Reason: There is schema mismatch.
2019/01/30-12:21:53, [VCS-1006], 3979, SW/0 | Active, ERROR, VDX6740, Event: VCS node rejoin, Coordinator IP: 10.214.234.95, VCS ID: 1,
 Status: rBridge ID 2 (10.214.234.91) failed to rejoin VCS cluster, Reason: There is schema mismatch.

Is it save to now upgrade second switch?

[Mick_Day]

Hi,

Upgrade from NOS 7.2x to 7.3x is a major upgrade and as such ISSU is not supported

The only option is coldboot, in your example as below

code:

firmware download logical-chassis ftp host 10.214.234.2 user anonymous directory / rbridge-id 1-2 coldboot

I would suggest that you upgrade each switch individually to minimize disruption to service

code:

firmware download logical-chassis ftp host 10.214.234.2 user anonymous directory / rbridge-id 2 coldboot

Start with the non-principal switch and once this is upgraded then upgrade the principal