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