[log in to unmask] wrote:

>     We currently have two systems a (959/400 and a 957).  We are
>     using Shareplex to shadow from the 959 to the 957.  Soon we will
>     be getting rid of the 957.  The question comes in for data
>     redundancy and high availability do we:
>
>     1. Use Shareplex to shadow to the same system?
>
>     2. Get rid of Shareplex and move to mirrored disk?
>
>     3. Use image logging?
>
>     4. Some combination of the above?
>
>     Any thoughts anyone has on this would be greatly appreciated

Since you already have Shareplex, I would shadow to the same system.  You
can move the disk drive(s) presently used for shadowing to the 959, so you
don't need to buy any more disk drives either.  Make it a separate class,
so that the shadow files are physically separate from the masters (you can
also make it a private volume, I think).  That way, you could physically
disconnect the shadow disks and hang them on another machine if needed in
an emergency.

John D. Alleyn-Day
Alleyn-Day International
408-286-6421   408-286-6474 (Fax)
[log in to unmask]       http://www.Alleyn-Day.com