Thus it was written in the epistle of John Clogg,
> I agree with Ken that Mirrored Disc/iX is a great product.  It is extremely
> reliable and the performance is excellent. One caveat I would offer,
> however, is that if your system ever goes down with anything other than
> "Shut 6" (e.g., a system crash), it will rebuild all the mirrors upon
> restarting the system.  If you have lots of mirrored pairs this can take
> several hours, during which your data is not fully protected and system
> performance is potentially impacted by all the I/O going on.  The
> implications of this are (1) never get impatient and halt your system during
> the seemingly infinite interval that it sits at Shut 5

I'd like to add that patience here is a good idea from other reasons.  Shut 5
start the shutdown of "system managers".  Now, I know no details but in a
recent hard-drive failure, I chose to ^B between shut 5 and shut 6 and came to
the conclusion from the mess afterward that one of the "system managers" is
the transaction manager and you'd really rather wait for it to do what it
wants to do before shutting down . . .

Ted
--
Ted Ashton ([log in to unmask]), Info Sys, Southern Adventist University
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The latest authors, like the most ancient, strove to subordinate the
phenomena of nature to the laws of mathematics.
                        -- Newton, Isaac (1642-1727)
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         Deep thoughts to be found at http://www.southern.edu/~ashted