From: Warren Young Sent: April 21, 2015 14:13 > On Apr 21, 2015, at 9:50 AM, Hugh E Cruickshank wrote: > > > > From: Kay Diederichs Sent: April 21, 2015 03:43 > >> > >> instead of having 20 for all of them, set > >> the first filesystem to 17, the second to 19, the third to > 23, and the > >> fourth to 29. > > > > Thanks but that is not much different then my second idea > and does not > > fully avoid the problem. > > You may be missing a key fact of how prime numbers work. You are right and I stand corrected. I have done some "what if" testing. Assuming 8 filesystems and weekly reboots over a ten year period... The random numbers would result in as many as 40 weeks per year where 2, 3 or 4 fscks would be run in the same week depending on the random numbers selected. Using the prime numbers 7, 11, 13, 17, 19, 23, 29 and 31 the is a maximum of 7 incidents per year of 2 fscks per week and none for 3 or more. Clearly the prime numbers are better. Thank, Hugh -- Hugh E Cruickshank, Forward Software, www.forward-software.com