[31576] in North American Network Operators' Group
RE: availability and resiliency
daemon@ATHENA.MIT.EDU (Leo Nelson)
Fri Sep 29 13:26:35 2000
Message-ID: <2A2BBEF175D5AC4F9796F03C98F08C1F7817AD@ax000002.phx.axient.com>
From: Leo Nelson <lnelson@axient.com>
To: "'Chris Flores'" <chris.flores@onfiber.com>,
Leo Nelson <lnelson@Axient.com>, "'nop@alt.net'" <nop@alt.net>,
Andrew Bangs <andrewb@demon.net>
Cc: nanog@merit.edu
Date: Fri, 29 Sep 2000 10:19:13 -0700
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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
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<DIV><FONT color=#0000ff face=Arial size=2><SPAN class=537211817-29092000>Thank
all of you who responded. I appreciate it.</SPAN></FONT></DIV>
<DIV><FONT color=#0000ff face=Arial size=2><SPAN
class=537211817-29092000></SPAN></FONT> </DIV>
<DIV><FONT color=#0000ff face=Arial size=2><SPAN
class=537211817-29092000>-leo</SPAN></FONT></DIV>
<BLOCKQUOTE style="MARGIN-RIGHT: 0px">
<DIV align=left class=OutlookMessageHeader dir=ltr><FONT face=Tahoma
size=2>-----Original Message-----<BR><B>From:</B> Chris Flores
[mailto:chris.flores@onfiber.com]<BR><B>Sent:</B> Friday, September 29, 2000
10:20 AM<BR><B>To:</B> 'Leo Nelson'; 'nop@alt.net'; Andrew Bangs<BR><B>Cc:</B>
nanog@merit.edu<BR><B>Subject:</B> RE: availability and
resiliency<BR><BR></DIV></FONT>
<DIV><FONT color=#0000ff face="Courier New" size=2><SPAN
class=283201417-29092000>Leo - </SPAN></FONT></DIV>
<DIV><FONT color=#0000ff face="Courier New" size=2><SPAN
class=283201417-29092000></SPAN></FONT> </DIV>
<DIV><FONT color=#0000ff face="Courier New" size=2><SPAN
class=283201417-29092000>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.</SPAN></FONT></DIV>
<DIV><FONT color=#0000ff face="Courier New" size=2><SPAN
class=283201417-29092000></SPAN></FONT> </DIV>
<DIV><FONT color=#0000ff face="Courier New" size=2><SPAN
class=283201417-29092000>Best regards.</SPAN></FONT></DIV>
<DIV><FONT color=#0000ff face="Courier New" size=2><SPAN
class=283201417-29092000></SPAN></FONT> </DIV>
<DIV><FONT color=#0000ff face="Courier New" size=2><SPAN
class=283201417-29092000>Chris</SPAN></FONT></DIV>
<BLOCKQUOTE style="MARGIN-RIGHT: 0px">
<DIV align=left class=OutlookMessageHeader dir=ltr><FONT face=Tahoma
size=2>-----Original Message-----<BR><B>From:</B> Leo Nelson
[mailto:lnelson@axient.com]<BR><B>Sent:</B> Friday, September 29, 2000 12:08
PM<BR><B>To:</B> 'nop@alt.net'; Andrew Bangs<BR><B>Cc:</B>
nanog@merit.edu<BR><B>Subject:</B> RE: availability and
resiliency<BR><BR></DIV></FONT>
<P><FONT size=2>Pardon my ignorance, but what the heck does a "9" refer too?
Is it a UPS, rack, floor space, circuit...</FONT> </P>
<P><FONT size=2>Thanks in advance</FONT> <BR><FONT size=2>-leo</FONT> </P>
<P><FONT size=2>-----Original Message-----</FONT> <BR><FONT size=2>From:
Lionel Lauer [<A
href="mailto:longword@newsguy.com">mailto:longword@newsguy.com</A>]</FONT>
<BR><FONT size=2>Sent: Friday, September 29, 2000 10:54 AM</FONT> <BR><FONT
size=2>To: Andrew Bangs</FONT> <BR><FONT size=2>Cc: nanog@merit.edu</FONT>
<BR><FONT size=2>Subject: Re: availability and resiliency</FONT>
</P><BR><BR>
<P><FONT size=2>On Fri, 29 Sep 2000 17:39:04 +0100, Andrew Bangs
<andrewb@demon.net></FONT> <BR><FONT size=2>wrote:</FONT> </P>
<P><FONT size=2>></FONT> <BR><FONT size=2>>On Thu, Sep 28, 2000 at
02:39:40PM -0600, Irwin Lazar wrote:</FONT> <BR><FONT size=2>>> Hi
all,</FONT> <BR><FONT size=2>>> Does anyone know if a template exists
for what it takes to provide 5 9's of</FONT> <BR><FONT size=2>>>
availability, 4 9's etc.for Internet data centers? Specifically I'm
looking</FONT> <BR><FONT size=2>>> for something that would say "if
you want 5 9's of availability, here's what</FONT> <BR><FONT size=2>>>
you need to do", and so on.</FONT> <BR><FONT size=2>></FONT> <BR><FONT
size=2>>For 5 9s you need:</FONT> <BR><FONT size=2>></FONT> <BR><FONT
size=2>>1) Lots of money</FONT> <BR><FONT size=2>>2) Lots of
clue</FONT> <BR><FONT size=2>>3) Lots of luck</FONT> <BR><FONT
size=2>>4) Lots of balls</FONT> <BR><FONT size=2>></FONT> <BR><FONT
size=2>>You can do 4 9s with any 3 of the above.</FONT> </P>
<P><FONT size=2>Too true.</FONT> </P>
<P><FONT size=2>But you forgot to include 'halfway-clued management' -
without that you</FONT> <BR><FONT size=2>haven't got a hope in hell of even
getting three 9's. ;)</FONT> </P>
<P><FONT size=2>-- </FONT><BR><FONT size=2>
W </FONT><BR><FONT
size=2> . | ,. w , "Some people are alive only
because</FONT> <BR><FONT size=2> \|/ \|/
it is illegal to kill them." Perna condita delenda
est</FONT> <BR><FONT
size=2>---^----^---------------------------------------------------------------</FONT>
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