Daniel Nashed's Blog

New technote about Domino 12.0.1 DAOS hang

It turned out the hang situation which can occur in combination with DAOS on larger servers is not completely fixed in 12.0.1 IF1.
In case you are running into hangs check the brand new technote for details:
https://support.hcltechsw.com/csm?id=kb_article&sysparm_article=KB0096771

The issue behind the problem is complex and the HCL team is working an a solution.

In this situation you should know your most reasonable options:

1. If you migrated to Domino 12.0.1 and run DAOS with larger databases


a.) If your servers are running good

• You should still try to avoid more critical operations like fixup, compact or resync during the day.
  
• Only use one compact thread ( e.g. load dbmt -ct 1 )
  
• Don't run multiple maintenance tasks at once.
  
• You should also disables DAOS on the mail.box of the server, because it increases the concurrency of DAOS operations as well.

b.) if you are running into issues

• Open a support ticket to request the latest version of the hotfix build for your specific problem.
  
• You should prepare NSDs and logs showing the locks similar to what you see in the technote.
  
• It makes sense to stay on 12.0.1. Migrating back will require a rebuild of the DAOS catalog because the catalog version changed
  
• If you already updated the ODS, you have to downgrade
  
• The way forward to get the hotfix is the right way in most cases!

2. If you did not yet migrate to 12.0.1 yet and run with large servers with DAOS enabled with many NLOs

• I would wait until 12.0.1 IF2 is released. This will ensure the current issues are resolved.
  
• HCL is working with high priority with customers and partners to ensure 12.0.1 IF2  addresses all known issues.
  
• Therefore if you know partners or customers running into hangs, let them know to contact support.

Domino 12.0.1 is a stable release and HCL put a lot of energy into it with great new features.

I am running it from day one in my environment.
So I would continue with 12.0.1 deployments and wait with the larger servers using DAOS for now.
I hope this helps! If you need help, I am here as well as always.

-- Daniel

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