Thank all of you who responded. I appreciate it. -leo -----Original Message----- From: Chris Flores [mailto:chris.flores@onfiber.com] Sent: Friday, September 29, 2000 10:20 AM To: 'Leo Nelson'; 'nop@alt.net'; Andrew Bangs Cc: nanog@merit.edu Subject: RE: availability and resiliency Leo - The '9' refers to a specific SLA (service level agreement). 5 9's is the guaranteed amount of network uptime. Another way to state 5 9's is - 99.999% uptime. This of course yields the amount of time a customer's service is not available. 5 9's is equivalent to 315 un-available seconds per year or 5 minutes. Best regards. Chris -----Original Message----- From: Leo Nelson [mailto:lnelson@axient.com] Sent: Friday, September 29, 2000 12:08 PM To: 'nop@alt.net'; Andrew Bangs Cc: nanog@merit.edu Subject: RE: availability and resiliency Pardon my ignorance, but what the heck does a "9" refer too? Is it a UPS, rack, floor space, circuit... Thanks in advance -leo -----Original Message----- From: Lionel Lauer [ mailto:longword@newsguy.com <mailto:longword@newsguy.com> ] Sent: Friday, September 29, 2000 10:54 AM To: Andrew Bangs Cc: nanog@merit.edu Subject: Re: availability and resiliency On Fri, 29 Sep 2000 17:39:04 +0100, Andrew Bangs <andrewb@demon.net> wrote:

On Thu, Sep 28, 2000 at 02:39:40PM -0600, Irwin Lazar wrote:

...

Hi all, Does anyone know if a template exists for what it takes to provide 5 9's

of

...

availability, 4 9's etc.for Internet data centers? Specifically I'm looking for something that would say "if you want 5 9's of availability, here's what you need to do", and so on.

For 5 9s you need:

1) Lots of money 2) Lots of clue 3) Lots of luck 4) Lots of balls

You can do 4 9s with any 3 of the above.

Too true. But you forgot to include 'halfway-clued management' - without that you haven't got a hope in hell of even getting three 9's. ;) -- W . | ,. w , "Some people are alive only because \|/ \|/ it is illegal to kill them." Perna condita delenda est ---^----^---------------------------------------------------------------