Migrating from ISS to Elasticsearch

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The message store supports the following migration strategies:

Side by side migration

  • Install a new message store.
  • Enable Elasticsearch and ISC on the new message store.
  • Migrate users from the old store to the new store with rehostuser.
  • Decommission the old store when all the users are migrated to the new store.

In-place migration

  • Upgrade the messaging server to
  • Enable Elasticsearch and ISC.
  • Enable impurge if it is not enabled.
  • Restart the server.
  • Folders are scheduled for migration automatically when they are accessed.
  • Run 'imcheck -H' to migrate all the folders.
  • Remove ISS event notification target and ISS client configuration on the message store.

See also: