ram failure not an issue
ram failure hasn't been an issue for a long time if you use the right hardware(no doesn't have to be mainframe or other "big iron")
ftp://ftp.hp.com/pub/c-products/servers/options/c00256943.pdf
"To improve memory protection beyond standard ECC, HP introduced Advanced ECC technology in
1996." [..]
Online spare memory, memory mirroring.. quite a few companies offer this kind of tech, though HP seems by far the most advanced and mature in my experience (tried it with Dell a few years ago and it required disabling something like half the DIMM slots just for Advanced ECC).