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Hi Gary, The number shouldn't include scheduled items. Those are taken as a given. regards, Stephen. On Tue, 12 Dec 2006, Buhrmaster, Gary wrote: > > Stephen, > >> Hi All, >> Another item for tomorrow if you have them available is >> reliability numbers. > > What is the basis for the reliability number? Mean time > between reboots (which looks like what you are doing > below)? Percentage of hours available per day? > > If one includes scheduled outages, I would say one > sees (about) 3-5 major patch cycles per year for > security and system updates (as always, your mileage > will vary). Which, if you look at it that way, means > somewhere around 90 days between reboots (which would > seem to suggest a 1% reliability number based on the > following estimates). > >> I remember for the VA Linux machines (sorry to open >> old wounds) that they typically needed rebooted once >> every 30 days, which put a 3% (roughly) needing >> rebooting per day. What is a similar number for >> other linux machines at SLAC? At CERN they claim >> the normal number is 1% which seemed kind of high >> to me. They also said that Fermilab had a similar >> number. > > Gary > > -- /------------------------------------+-------------------------\ |Stephen J. Gowdy, SLAC | CERN Office: 32-2-A22| |http://www.slac.stanford.edu/~gowdy/ | CH-1211 Geneva 23 | |http://calendar.yahoo.com/gowdy | Switzerland | |EMail: [log in to unmask] | Tel: +41 22 767 5840 | \------------------------------------+-------------------------/