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[Bernard Peek]

- Tethys wrote:
> On Thu, Nov 5, 2009 at 6:27 PM, Bernard Peek <bap at shrdlu.com> wrote:
>
>   
>> I've heard lots of people tell me that it's impossible to build a stable
>> Windows system when I know that it passed the five-nines (given
>> competent administrators) availability point nearly ten years ago.
>>     
>
> Yes and no. Ten years ago, I was working for one of the few (only two,
> IIRC) vendors[1] that offered five nines Windows systems, and while it
> was strictly true, it was cheating somewhat. The only way to get that
> level of reliability was to sell a system that effectively consisted
> of two separate machines running in a cluster (albeit in a single
> physical box), so that when one went down, the other took over. Five
> nines from a single box running Windows simply wasn't viable at the
> time. Fortunately, I haven't been near a Windows system since then[2],
> so I have no idea whether the situation has improved or not. I suspect
> it has. Are they able to deliver five nines yet? No idea...
>   

I wasn't talking about a system that promised five-nines, but one that 
was delivering it using clustering.

It was difficult to do and needed careful administrators but it was 
possible. I suspect that the target to beat is now seven-nines.


-- 
bap at shrdlu.com

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