F5 recommends to assign 2/4/6/8 and so on cores never 1/3/5 etc. so the best practices were not followed also 1x4 or 2x2 will have the same memory as memory is given for 1 core, so to have more memory you may need to do 2x4. Please see https://support.f5.com/csp/article/K14218 . Better assign half the cores from 1 slot and the other half from other as if blade fails and you need RMA not the entire vCMP quest will crash, it will still work but with half the CPU and memory, so better use 2x4 than 1x8. See below to get the idea:
As when the vCMP quest is on two blades it is just a plug and play, you remove the faulty blade and add the new one and that is it.