Creation and placement of a File Share Witness is demonstrated as a required element to maintain quorum in an Exchange Server 2016 Database Availability Group.
- The concept of a witness server may be familiar…to any of you who that are database administrators,…but for those that are not, a witness server…is a file share, that receives updates regarding…who has the most current version of the database.…Consider this scenario: we have two Exchange servers…in a DAG, both have been working together…and synchronizing for a long time.…One day the principal, or original copy…of the database, goes down for a few hours,…to run the newest cumulative update or something.…
When that server comes back online, it could…address the replica of the database and say "I'm back now.…"Go ahead and update yourself from my content."…The replica, that's been holding down the fort…while the principal was being updated,…believes itself to be the most complete database,…and should be considered the authority.…So this vote is now stuck at one to one,…unless a witness server steps in.…The witness server doesn't hold a copy of the database,…but it knows about the transactions, so it can verify…
Author
Released
5/31/2017- Planning and managing database storage
- Setting database requirements
- Storage architecture
- Virtualization scenarios
- Creating and managing mailbox databases
- Failure domains and SLA requirements
- Proper placement of a file share witness
- Site resilient DAG
- Troubleshooting database replication, performance, and database failure
- Planning for SLA recovery requirements
Skill Level Intermediate
Duration
Views
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Introduction
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Welcome40s
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What you should already know1m 24s
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1. Plan and Manage Database Storage
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Capacity and placement6m 54s
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Storage architecture5m 45s
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Virtualization scenarios5m 47s
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2. High Availability Mailbox Databases
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Server management4m 5s
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Mailbox database copies2m 59s
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3. Site Resilient DAG
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Quorums and quorum modes4m 41s
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Alternate file share witness2m 48s
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AutoReseed5m 22s
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Site recovery3m 36s
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4. Troubleshooting Mailbox Databases
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Transaction logs6m 8s
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Troubleshooting performance7m 11s
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5. Backup and Recovery Solutions
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Restoring from a backup7m 27s
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Dial tone restores9m 7s
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Conclusion
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Next steps58s
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Video: Proper placement of file share witness