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
>
>
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