Connecting 2 1920 Switch stacks

[Toranagtrx]

Hi, I have 6 HP 1950 switches that I am deploying. 

I was thinking of having 1 stack of 4 and 1 stack of 2, the stack of 2 will have edge connections and servers etc and the stack of 4 is all client PC's and Phones/Printers etc. They are side by side in our racks so close to each other.

I am confused about how best to uplink from the stack of 4 into the stack of 2.

I will be utilising the 2 SFP ports on each switch for the uplinks.

So on my 4 stack I will have 8 SFP ports to use and on the stack of 2 I will have 4 available.
I am trying to use as little cabling as possible for the uplinks while still having some redundancy. 

[parnassus]

Hi, since you want to use (that's reasonable!) SFP Interfaces on both IRFs (the four members one and the other two members one) you're thus limited by the grand total of 4 SFP Interfaces provided by the two members IRF.

If I were you I will create a 4 links LACP LAG on both, say BAGG1 and BAGG1, with 4 member links distributed on all four - so using 1 SFP per Member - IRF Members on one side - your Stack 1 - and with the peer 4 member links distributed on all other two - so using 2 SFP per Member - IRF Members on the other side - your Stack 2) and then interconnect them via that LAG...in this way you will have enough redundancy/resiliency.