Not really an issue, but some questions:

1. Does magent duplicates a key-value pair to multiple memcached backends, or just one of them?
2. How many connections magent will establish to one backend?
3. Is there a way to know whether a backend is live or dead, and how to manually mark a backend as live or dead?

Thanks a lot, it's a good idea. :)

1) magent will write one key-value pair to normal memcached server farms and backup server farms at the same time. it's in TODO list 2) currently max free keep-alive connection number to one backend is 50(hard coded by

define MAXIDEL 50). it can be configured by arugment if needed

3) health check is in TODO list.

one more comment: we can add one management port for magent which provides some handy tools such as to enable/disable backend on the fly

What you meant by 'memcached server farms', is it a group of memcached servers and each of them stores a subset, just like the memcache php extension?

yeah. you r right! so php can connect local magent, instead of a lot of memcached servers.