Two Questions Regarding AWS' RDS Multi AZ

amazon-ec2 scalability amazon-rds
Nick picture Nick · Apr 5, 2011 · Viewed 7.3k times · Source

  1. 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?

  2. 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?

Answer

Sanket Dangi picture Sanket Dangi · Apr 6, 2011

Answers to your questions are written down :

  1. 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.

  2. 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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