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I understand that when upgrading to a Multi-AZ rds from a Single-AZ, there occurs a "breef i/o freeze". What exactly does that mean?
When an upgrade is made to a Multi-AZ deployment, say from small to large, will the production database be impacted at all? Will it be able to use the backup databse, then failover?
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In an Amazon RDS Multi-AZ deployment, Amazon RDS automatically creates a primary database (DB) instance and synchronously replicates the data to an instance in a different AZ. When it detects a failure, Amazon RDS automatically fails over to a standby instance without manual intervention.
An existing Single AZ instance can be converted into a Multi-AZ instance by modifying the DB instance without any downtime.
Benefits of Read Replica Read Replica helps in decreasing load on the primary DB by serving read-only traffic. A Read Replica can be manually promoted as a standalone database instance. You can create Read Replicas within AZ, Cross-AZ or Cross-Region.
What would happen to an RDS (Relational Database Service) Multi-Availability Zone deployment if the primary DB instance fails? IP of the primary DB Instance is switched to the standby DB Instance. A new DB instance is created in the standby availability zone.
Answers to your questions are written down :
When you choose to move from Single AZ to Multi AZ, brief I/O freeze happens. It means that for some duration database won't be accessible. No read,write operations will be performed on the database. Mostly, the duration for this is around 3-4 minutes.
Yeah, production database will be affected when you resize the compute(from small to large). The best idea to perform resize operation is during scheduled maintenance window. If select Apply Immediately option, for sometime the database won't be accessible(time to switch control to backup server).
Regards, Sanket Dangi
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