Yes, that is exactly what I would recommend. While failures of EMC arrays (or other single box storage systems) are rare, they do occur. And when they do, organizations that are not prepared for them can be badly hurt. Since SRDF does not permit parallel access to both copies at the same time, it does not replace software mirroring (RAID 1). Since SRDF usually replicates to a remote site, there would also be performance implications, even if you could access both copies at the same time.
Evan L. Marcus
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This was first published in October 2002