Availability numbers tend to be putty... An electrician abruptly halted one
of my servers today. I wouldn't count that against the machine or the OS....
I have seen vendors exclude all kinds of time from the 'up-time'
calculation. Usually in the denominator for their systems and the numerator
for their competitors systems :-)
Richard Ames
linsup.com, Sydney, Australia
Tel: +61 2 9144-6131
mailto:[EMAIL PROTECTED] http://www.linsup.com
> -----Original Message-----
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED]]On Behalf Of Rev Simon
> Rumble
> Sent: Tuesday, 7 December 1999 10:17
> To: [EMAIL PROTECTED]
> Subject: [SLUG] What is reasonable availability?
>
>
> Hi folks.
>
> I'm speccing a system at my NT-zealot work. I have no chance of getting
> this system built in the deadline we have on anything but NT--we just
> don't have the coding expertise in-house. However, I wish to use it as
> additional ammunition in my war against braindead technology decisions.
>
> So what I'd like to do is specify a reasonable level of availability for
> what the system is to be: a reasonably heavily utilised, database-driven
> web server.
>
> Now how does one arrive at figures like what IBM like to quote like 99.9%?
> Does that exclude planned maintenance? If so, does planned maintenance
> include software upgrades such kernel upgrades? How about application
> upgrades (reboot necessary for NT, not generally for Unix)? Or is it just
> harware upgrades?
>
> So what is a reasonable level of availability, without going to Local
> Director-based load balancing or something overboard like that? This
> isn't for a bank or the military--so I need to be reasonable about it.
>
> My reason for this is because I just get dumbfounded when these souped up,
> enormously fault-tolerant, super-fast, super overpowered web servers fall
> over with fscking crap software failures. We won't talk about the file,
> print, proxy or directory servers... I'll start foaming at the mouth :)
>
> ---
> Rev Simon Rumble Politics -- the gentle art of getting votes from
> [EMAIL PROTECTED] the poor and campaign funds from the rich by
> http://www.rumble.net by promising to protect each from the other.
> -- Oscar Ameringer
>
> --
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