Snow Owl Docs
8.x
9.x8.x7.x
8.x
9.x8.x7.x
  • README
  • Getting started
    • Basic Concepts
    • Installation
    • Explore Snow Owl
      • Check Health
      • List available Code Systems
      • SNOMED CT
      • Import RF2 distribution
      • Search SNOMED CT
      • Create a Concept
      • Version SNOMED CT
      • Export SNOMED CT
    • Conclusion
  • Set up Snow Owl
    • Installing Snow Owl
      • Installing Snow Owl with .zip or .tar.gz
      • Installing Snow Owl with RPM
      • Installing Snow Owl with Debian Package
      • Installing Snow Owl with Docker
    • Configuring Snow Owl
      • Setting JVM options
      • Logging configuration
      • Elasticsearch configuration
    • Important Snow Owl configuration
    • Important System configuration
      • Disable swapping
      • File descriptors
      • Virtual memory
      • Number of threads
      • Tweaking for performance
    • Starting Snow Owl
    • Stopping Snow Owl
    • Configuring security
      • Configuring a file realm
      • Configuring an LDAP realm
    • Configuring monitoring
    • Configuration reference
  • Extension Management
    • Extensions and Snow Owl
    • Scenarios
      • Single Edition
      • Single Extension Authoring
      • Multi Extension Authoring
    • Development
    • Releases
    • Upgrading
    • Integrations
  • API
    • Core API
    • SNOMED CT API
      • Branching
      • Compare
      • Commits
      • Concepts
      • Descriptions
      • Relationships
      • Reference Sets
      • Classification
      • Importing RF2
      • Exporting RF2
    • CIS API
    • FHIR API
      • CodeSystem
      • ValueSet
      • ConceptMap
  • Backup and Restore
    • Curator
  • Migrate from 7.x
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Migrate from 7.x

Last updated 3 years ago

The following major differences, features and topics are worth mentioning when comparing features present in Snow Owl 7 and 8 and migrating an existing 7.x deployment to Snow Owl 8.x.

NOTE: It is highly recommended to keep the previous Snow Owl 7 deployment up and running until you have the data and all connected services migrated to the new version successfully. The new Snow Owl 8 system should get its own dedicated machine and deployment environment. Rolling back to the previous state should be available and must be executed when the upgrade cannot be performed successfully.

Database content

Due to resource and access management schema changes the old content present in a 7.x index cannot be used by a Snow Owl 8 installation. To migrate an existing dataset to the new version, perform an export in the old system and use the exported files to import the content back into the new Snow Owl 8 version.

Configuration changes

The following configuration settings have been changed:

  • Most of the snomed configuration keys have been added to runtime settings under the CodeSystem.settings property. If you have been using any of these configuration values, please raise a ticket and we will help you migrate your current installation to the new version.

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