Re: Facility wide DR/Continuity

[William Herrin <herrin-nanog () dirtside com>]

On Wed, Jun 3, 2009 at 11:15 AM, Roland Dobbins<rdobbins () arbor net> wrote:
> Active/passive is an obsolete 35-year-old mainframe paradigm, and it
> deserves to die the death.  With modern technology, there's just really no
> excuse not to go active/active, IMHO.

Roland,

Sometimes you're limited by the need to use applications which aren't
capable of running on more than one server at a time.  In other cases,
its obscenely expensive to run an application on more than one server
at a time. Nor is the split-brain problem in active/active systems a
trivial one.

There are still reasons for using active/passive configurations, but
be advised that active/active solutions have a noticeably better
success rate than active/passive ones.

Regards,
Bill Herrin


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