Problem

The index status of the database is failing. It can be verified via the command Get-MailboxDatabaseCopyStatus

Resolution

If a DAG is present, we will cut the copy:

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Suspend-MailboxDatabaseCopy – Identity dbname\exchangeserver2
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We will stop indexing services

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Stop–Service MSExchangeFastSearch
Stop–Service HostControllerService
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We go to the directory where the database is stored.

we will delete the directory with a GUID

We will start indexing services

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Start–Service MSExchangeFastSearch
Start–Service HostControllerService
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We will update the catalog on the passive server (if a DAG is present)

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Update-MailboxDatabaseCopy – Identity dbname\exchangeserver2 -SourceServer exchangeserver1 -CatalogOnly
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We will check the status of the databases via the command:

Get-MailboxDatabaseCopyStatus