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…
AuthorScott M Burrell
- 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
Deploying Exchange Server 2016with Robert McMillen3h 1m Intermediate
Exchange 2016: Client Access Serviceswith Scott M Burrell1h 50m Intermediate
Exchange 2016: Transport Serviceswith Scott M Burrell2h 24m Intermediate
1. Plan and Manage Database Storage
2. High Availability Mailbox Databases
3. Site Resilient DAG
4. Troubleshooting Mailbox Databases
5. Backup and Recovery Solutions
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