Q: How can I do Memcached HA? I use memcached to save about 5MB data. About forty percent of the data updates ever seconds, that causes about 280 qps between memcached client and server, with get and set each takes half of the queries. Except the realization of such great data transaction, I also meet the HA problem.
Before I choose memcached, I've also looked at Redis. But it seems to be only one thread and not likely to performs well on data persistence. Also the client for Redis is not that easy and reach when it stands with Memcached.
But how can I do HA with memcached? How should I keep data duplication between the Master and slave memcached server; And when a memcached server crashed, it follows with the data consistency problem. Are there already some good tools for memcached HA, or if there is a better NoSql Database instead of memcached?

A: Maybe you can use repcached(repcached.lab.klab.org) or magent(https://code.google.com/p/memagent/)
