RE: NICs - bottleneck (was Re: Dropping the AS/400 as a Web serving platform)

["Walden H. Leverich" <WaldenL@xxxxxxxxxxxxxxx>]

On a web there is no difference. Would you be upset if you went to
Amazon.com and saw a page that said, "We're sorry our site is currently down
due to PLANNED downtime. Please visit us again in an hour." I know I'd be
really pissed off.

Part of the argument against the AS/400 vs. a server farm is that the 400 is
a single point of failure. I don't care how rarely the 400 is down (Planned
and unplanned) when it's down the site is down. However, if I have a farm of
W2K servers and I assume 99% uptime per server (VERY fair assumption) then I
only have to have 3 machines in my farm to have a 99.9999% uptime (in
theory). Hey, but these machines are cheap, let's have 6. In theory that's
99.9999999999% uptime.

-Walden

-----Original Message-----
From: Dave Schopp [mailto:dschopp@imt.net]
Sent: Wednesday, October 03, 2001 4:27 PM
To: midrange-l@midrange.com
Subject: RE: NICs - bottleneck (was Re: Dropping the AS/400 as a Web
serving platform)


I am just guessing here, but I believe that magic of "five nines" refers to

    UNPLANNED

downtime, not the scheduled, planned for, anticipated, regular downtime that
all shops perform.

Just a guess.

-----Original Message-----
From: midrange-l-admin@midrange.com
[mailto:midrange-l-admin@midrange.com]On Behalf Of Walden H. Leverich
Sent: Wednesday, October 03, 2001 14:17
To: 'midrange-l@midrange.com'
Subject: RE: NICs - bottleneck (was Re: Dropping the AS/400 as a Web
serving platform)


>you want the 99.9999 reliability?

Surely you jest. 99.9999% That's 31.5 SECONDS of downtime in a year. Given
that there isn't an AS/400 that you can shutdown and re-ipl within 31.5
seconds you're saying you haven't IPLed this year, at all, for anything
(release, PTF, crash?)

Maybe 99.999%, well that just over 5 minutes. I doubt you could bring a
machine down and back up in five minutes.

Maybe 99.99%, that would be almost an hour. That I'd buy. Of course I have
no problem getting that from a cluster of W2K machines either.

-Walden


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