On Thu, Oct 30, 2014 at 9:21 PM, John R Pierce <pierce at hogranch.com> wrote: > On 10/30/2014 1:07 AM, Cliff Pratt wrote: > >> I used to work with IBM mainframes back when the dinosaurs were >> hatchlings. >> At one place I worked the machine was powered off on Friday at 5pm and >> powered up at 7am on Monday! Can you imagine that these days? >> >> We soon went to 24x7, but the reason was not because the users wanted it. >> It was because the engineers and systems programmers wanted time with no >> users. >> > > main reason I remember for keeping stuff running was, it was more reliable > if the temperature was relatively constant... temperature flucations led > to more hardware failures than any other source input variable. > > Yes, that too. We had quite a few cases of machine mondayitis. Cheers, Cliff