[geeks] Sun-HOWTO

[Ken Hansen]

Mainframes have supported "live" upgrades for a while,
IIRC. You could shut down part of the system for an
upgrade/repair without bringing the complex down...

I would expect the same of the Sun boxen, but Pete is
right - you can't swap *everything*. When I was in
mainframes, most shops that could, hade more than one
system - they always had one for development/testing
that was a much lesser box than the units in
production, since they were 100% code-compatible
(within families - a 3090/600 for peoduction, and a
3090/200 for development, for example).

Ken

--- "Peter L. Wargo" <pwargo at basenji.com> wrote:
> On Fri, 19 Oct 2001, Joshua D Boyd wrote:
> 
> > They don't support hotswapping everything?  My
> understanding is that with
> > IBMs it is traditional to have hotspare machines
> only if one is offsite or
> > it is used for life critical applications.  And
> zServers seem to be what
> > Sun is targetting.
> 
> Hard to hotswap a centerplane, though the SF15K's
> can degrade on the fly
> to double-pumped to accomodate a failed ASIC.  Also,
> it has redundant
> clock sources, etc.  But, some places like to have
> full mirroring of a
> system...


=====
Ken
n2vip at yahoo.com

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