>IF the data in the file is corrupt the mirror will be identical to the other
>and corrupt also...

...If RAID, disk mirroring or opsys mirroring are employed.
Do as Dwight does (and I do) and use *SM mirroring.  MIRRORWrite Sequential
is the safer form.

We had an exhausting discussion about this perhaps a year ago, as you can view
in the archives, with valuable developer input.  No one really wants to go
through that again, so there has been little response on the issue.  A summary:
ADSM Sequential mirroring *is* better than RAID because of the danger
of partial page writes - which *do* occur in the real world as hardware and
human defects evidence themselves.  RAID will
perform the partial writing in parallel, thus resulting in a corrupted
database if the writing is interrupted, whereas ADSM Sequential mirroring will
leave you with a recoverable database - by simple resync, not "recovery".
That is, RAID is just as problematic as ADSM Parallel mirroring.

   Richard Sims, BU