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...ave done some "what if" testing. Using which tool? My simulator, or something you cooked up yourself? If the latter, would you care to share? I?ve updated mine to break out the stats for 3+ volumes instead of just reporting all multi-volume fscks together: https://gist.github.com/wyoung/7c94967bb635de48d058 Then I rewrote that in C++, since these 8-volume simulations were literally going to take days with the Perl version: https://gist.github.com/wyoung/966383b4efbb63aafc71 (The Perl version is about 1/5 the speed of the C++ one. This actually isn?t all that bad, consideri...

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

...l prime, but is *relatively* prime, since there is no integer other than 1 that evenly divides any pair among the set. This set gives about a 1.5% chance of a 2+ volume collision, nearly as good as Kay?s prime set. I?ve put the calculator I built to test this up here: https://gist.github.com/wyoung/7c94967bb635de48d058

From: Kay Diederichs Sent: April 21, 2015 03:43 > On 04/21/2015 06:08 AM, Hugh E Cruickshank wrote: > > > > The second idea was to set each filesystem to a different random > > count value. This would run the risk of having two or more > > executions at the same time but it would probably not be very > > frequent. > > Using "tune2fs -c", set the