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Jim--
Even with Mimix, a cutover to the backup system is not instantaneous;
it is not a dual server solution.
Issues include--
-Waiting for the last transactions on the receiving system to be
applied. This should only be a few minutes, but it all depends on
whether the receiving system was behind on the applies or not.
-Switching communications to the alternate machine. Your router
should be able to help, but you need to define the conditions that
define a 'disaster,' so the cutover doesn't happen when you're not
expecting it.
-Is the cutover automatic, or under manual control.
-Unless you have committment control of your applications, batch jobs
will not roll back to a known-clean position.
-Interactive jobs will have to connect to the alternate machine and re-start.
Because of the need to have everything under committment control, we
accept that a calamity that befalls our main system will require some
time until the backup machine can take over.
We use Mimix mainly to keep a duplicate copy of our data base. Our
backups run mostly from the duplicate copy; the users aren't
disturbed by us needing to save their files.
Our second machine also gives us a playground for programmers; we can
restrict access to the live system.
--Paul E Musselman
PaulMmn@xxxxxxxxxxxxxxxxxxxx
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