Let's try again. Sorry for the html.

----- Original Message -----

From: Robert MacDonald

To: Worrell, Brian <BWorrell (at) isdh.IN (dot) gov [email concealed]>; Kosala Atapattu <kosala.atapattu (at) gmail (dot) com [email concealed]>; Scott <whip (at) supportmenot (dot) com [email concealed]>

Cc: bs7799 (at) securityfocus (dot) com [email concealed] <bs7799 (at) securityfocus (dot) com [email concealed]>

Sent: Thu Feb 28 08:40:42 2008

Subject: re: Maximum SLA?

Wouldn't the total outage time depend on the wording of the SLA?

If the SLA excludes maintenance downtime (weekly/monthly tech windows),

then the ~5 minutes could be achieved much easier.

________________________________

From: Worrell, Brian

Sent: Thu 2/28/2008 7:39 AM

To: Kosala Atapattu; Scott

Cc: bs7799 (at) securityfocus (dot) com [email concealed]

Its been a while, but if I recall the number, at 5 9's, that means less

than 5 minutes downtime for the entire year. Being realistic, even in a

perfect environment, is it really possible to have zero issues that

would cause any down time?

Thinking from a clustered network, with clustered servers, etc. what's

the best case for failover on them, 20 seconds?

My thought would be that anything more than 5 9's would be hard to do,

over then entire system.

Just my two coppers....

(Wiki ref on uptime math http://en.wikipedia.org/wiki/Uptime )

-----Original Message-----

From: listbounce (at) securityfocus (dot) com [email concealed] [mailto:listbounce (at) securityfocus (dot) com [email concealed]]

On Behalf Of Kosala Atapattu

Sent: Thursday, February 28, 2008 6:16 AM

To: Scott

Cc: bs7799 (at) securityfocus (dot) com [email concealed]

A dynamic web page, like a portal service. Which involves Websphere

clustered infrastructure with a DB backend, on a HA clustering.

I just want to know whether there is anybody who managed to achieve 5

9's or more for a setup as above.

Even for a static web page, can you achieve more than 5 9's uptime, for

example 6 9's?

Kosala

On Thu, Feb 28, 2008 at 2:06 PM, Scott <whip (at) supportmenot (dot) com [email concealed]> wrote:

> It really depends on what service you are providing at 5 9's. It is

> relatively easy to publish a simple static web page to 5 9's uptime,

> but a full company IT infrastructure at 5 9's is a different kettle of fish.

>

> What exactly are you wanting to know?

>

> Cheers,

> Scott

>

> -----Original Message-----

> From: listbounce (at) securityfocus (dot) com [email concealed]

> [mailto:listbounce (at) securityfocus (dot) com [email concealed]] On Behalf Of Kosala Atapattu

> Sent: Thursday, 28 February 2008 6:22 PM

> To: bs7799 (at) securityfocus (dot) com [email concealed]

>

> Dear All,

>

> Is there anybody in this list who adhere to a SLA of more than

> 99.999% (or 5 9's). What is generally required to achieve a SLA more

> than 5 9's?

>

> --

> Kosala

>

> blog.kosala.net

> www.linux.lk/~kosala/

> http://www.kosala.net/

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