Redis storing list inside hash

I have to store some machine details in redis. As there are many different machines i am planning to use the below structure

server1 => {name => s1, cpu=>80}server2 => {name => s2, cpu=>40}

I need to store more than one value against the key CPU. Also i need to maintain only the last 10 values in the list of values against cpu

1) How can i store a list against the key inside the hash?

2) I read about ltrim. But it accepts a key. How can i do a ltrim for key cpu inside server1?

I am using jedis.