[kragen]

in 01973 the s/360 did not have hot-swappable cpus or memory

even in the 01990s i don't think ibm had such an offering, though tandem did (but it couldn't run ims)

[jpgvm]

it didn't run ims but it ran nonstop SQL instead which was a rdbms designed for their redundant hw architecture

[kragen]

right, i didn't mean to imply it didn't support acid