We frequently upgrade our Amazon ElastiCache fleet, with patches and upgrades being applied to instances seamlessly. However, from time to time we need to relaunch your ElastiCache nodes to apply mandatory OS updates to the underlying host. These replacements are required to apply upgrades that strengthen security, reliability, and operational performance.
You also have the option to manage these replacements yourself at any time prior to the scheduled maintenance window. When you manage a replacement yourself, your instance will receive the OS update when you relaunch the node and your scheduled maintenance window will be cancelled.
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1010 0766
Beijing Region
Operated By Sinnet
1010 0966
Ningxia Region
Operated By NWCD