Data in memcached have a big impact on database server. If you flush everything in the memcached and let the program fill the cached again, this might effect server performance for a while. To migrate memcached server there are memcached-tool and nc command to help you
$ memcached-tool server1:11211dump |nc server2 11211
This command will dump everything from server1 to server2. However, if your data didn't set expiration, the data might be lost during migration. As always, test what you are going to do before go to production.
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