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Different Ontap versions on both nodes

Hello Experts,

Wondering if we had a situation wherein we were in the middle of ontap upgrade ..and it was decided due to some issue NOT to perform the second node TO/GB.

How long can these two nodes be running different versions until some issue would surface?Note that we are very well aware that both the heads should be at different version for minimum amount of time,but how long can this time be ?

We had an issue with the cisco switch ports during the first node TO/GB and suspect that this is a network side issue hence this kind of approach was being thought?

Any advice

Balajia

Re: Different Ontap versions on both nodes

well you could run it a long time but in the event of a system failover it probably will not takeover due to the mismatch even if it is a minor upgrade release. 

Last time this happened to me I decided to revert, then at a later time attempted again the upgrade.  It is important to do a full check before upgrading as best practices to avoid this situation but it happens especially if certain checks are out of your control.

I would take a look at the upgrade/revert guide for what version of ONTAP you were upgrading.

Re: Different Ontap versions on both nodes

Thanks ..what you say about an accidental takeover not working until both the versions are same makes sense.

However in our case it was not a problem of improper pre-checks.After the first TO/GB we noticed that due to LACP configuration and a bug (Bug id # 337379) the network ports wne  went offline/unresponsive causing all the vfilers to be not reachable causing complete outage.A shut/noshut was needed on the network ports to finally ensure that the vfilers were reachable (i.e the VIF was up and running again).So we have both the nodes running different ontap versions as of now.

We are checking what caused the network ports to go offline (from network team side) before performing the second TO/GB.

Our nest step is - to find the RCA for port offline and ensure that everything is fine on the network switches (LACP,trunking etc ) before performing the second node TO/GB .

So wondering how did you finally finish your upgrade?

Balaji

Re: Different Ontap versions on both nodes

I would recommend opening a support case if this needs to be non-disruptive

Things you will need and they will probably request.

      run config checker

     verify RC file is correct

     verify switch configuration (you  already mentioned  this)

Was failover successful before the upgrade? 

In some cases I had to revert to the previous version of ONTAP and wait for problem to be resolved. 

Maybe someone else can help on this forum but you would need to post basic filer configuration and version to go further.