Practical limit on number of memcached servers in a single pool?

[EKC]

What is the practical limit on the number of servers I can have in a
memcached pool? 10's, 100's, 1000's? I'm using a gigabit switched LAN
with all of the servers on the same subnet. I say thousands because I
am using many virtual vmware servers.

What is the largest number of servers that someone has used in a memcached pool?

My strategy for dealing with crashed servers is to treat them as
cache-misses (no re-hasing of keys to servers). I'm using the Perl
API.

Also, if I build a new server and want to add it to an already running
pool, can I do that without restarting memcached on each of the
servers in the pool? Can I do a rolling restart? So, if I want to add
server n+1 to a pool of n running memcached servers, I would do:
1) start memcached on server n+1 with a pool list of all n+1 servers
2) for each server 1...n, add server n+1 to the pool list and restart memcached

Or, is there better way of adding a new server to a running pool?

I'm not too concerned with cache misses while memcached is restarting.

Thanks in advance!