Ken,
I can add material relating to our SLA discussion in
the Policies and Contracts section.
Danny
--- Ken Laskey <> wrote:
> Very true, which is why I included "but then you
> have to collect
> metrics to compute and need a way to respond to
> requests to see the
> average." The implied addition was that the term
> average was defined
> at some referenced location and itself could be
> retrieved.
>
> BTW, where in the RA will this discussion be
> captured and is anybody
> signed up to do it? I'd very much like to pass this
> around during
> discussions at MITRE.
>
> Ken
>
> On Mar 5, 2007, at 5:22 AM, Poulin, Michael wrote:
>
> > So, the general rule for an SLA is that all listed
> characteristics
> > out to be measurable. In this case, a statement
> like "you will get
> > 20% faster response than the average" is not a
> legitimate SLA
> > statement because it cannot be measured - the
> 'average' value is
> > not defined, i.e. the statement is not
> self-contained or complete.
> > Actually, the latter note may be the second
> requirement to an SLA.
> > Moreover, a statement like "an average response
> time should be less
> > than 3 seconds" is also not self-contained because
> 'average' value
> > changes over the time; so, the proper statement
> has to sound like
> > "an average response time should be less than 3
> seconds for any 30
> > minutes after first 1 hour of work".
> >
> > I agree with Duane, nobody would care how long a
> response time is
> > if "it is within an acceptable amount of time"...
> after "an
> > acceptable amount of time" is clearly defined.
> >
> > - Michael
> >
> > From: Ken Laskey [mailto:]
> > Sent: 28 February 2007 02:59
> > To: Duane Nickull
> > Cc: Poulin, Michael;
>
> > Subject: Re: [soa-rm-ra] RE: updated service
> description
> >
> > I more align with Duane's thinking here. The SLA
> has to specify
> > what is being measured and what is the standard or
> limit against
> > which it is being compared. An SLA can say you
> will get 20% faster
> > response than the average, but then you have to
> collect metrics to
> > compute and need a way to respond to requests to
> see the average.
> >
> > Ken
> >
> > On Feb 27, 2007, at 12:07 PM, Duane Nickull wrote:
> >
> >> But if you cannot see the response time of the
> other service
> >> requests for comparison, how can the consumer
> surmise they got the
> >> SLA they are assured of? Should they really
> care? As long as it
> >> is within an acceptable amount of time, it
> shouldn’t matter.
> >>
> >> Duane
> >>
> >>
> >> On 2/27/07 5:42 AM, "Poulin, Michael"
> <-
> >> intl.com> wrote:
> >>
> >>> The "priority over al others" - like silver/gold
> user types -
> >>> may be exposed as a 'response time', which can
> be easily
> >>> monitored and measured. Moreover, why a SLA has
> to contain only
> >>> run-time characteristics? It may contain a
> 'change control
> >>> response time' (in days) as well, right?
> >>> The difference between SLA and Service Contract
> may be viewed as
> >>> Policy section that cannot be a part of SLA.
> >>>
> >>> - Michael
> >>> Fidelity Investments - Web Delivery
> >>> Phone: +44-173-783-6038
> >>> E-mail:
> >>> <BLOCKED::mailto:>
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> <BLOCKED::http://
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> >>>>
> >>>>
> >>>> From: Duane Nickull
> [mailto:]
> >>>> Sent: 26 February 2007 18:51
> >>>> To: Ken Laskey;
> >>>> Cc:
> >>>> Subject: Re: [soa-rm-ra] RE: updated service
> description
> >>>>
> >>>>
> >>>> SLA can only encompass externally visible
> facets of a services
> >>>> operations, otherwise it is more or less moot.
> Why would
> >>>> someone even contemplate saying “your service
> request will be
> >>>> treated with priority over al others” if there
> is no way to
> >>>> verify or authenticate from an external
> standpoint? SLA’s
> >>>> should really just stick to things like
> timeouts, error
> >>>> reporting and other externally visible
> behaviors.
> >>>>
> >>>> My $0.02.
> >>>>
> >>>> D
> >>>>
> >>>>
> >>>> On 2/25/07 2:21 PM, "Ken Laskey"
> <> wrote:
> >>>>
> >>>>
> >>>>> Michael,
> >>>>>
> >>>>> I started to respond to this hours ago, then
> printed out your
> >>>>> paper, and finally make it past numerous
> distractions
> >>>>> (including a unexpected 3 inches of snow to
> shovel) to finally
> >>>>> collect my thoughts.
> >>>>>
> >>>>> On your first point, I think of the service
> description as
> >>>>> being the executive summary and table of
> contents. It gives
> >>>>> you the critical overview and tells you where
> to find more
> >>>>> details. So while Interaction Policies &
> Contracts in the
> >>>>> description may explicitly lay out such
> things, these are more
> >>>>> likely to be fully defined elsewhere and
> referenced from the
>
=== message truncated ===
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