Q

Protecting against disk array failure

What do you recommend for protecting against failure of a disk array? We have replication via EMC SRDF, but failover is not automatic. Do you use "duplex mirroring" via software RAID1 connecting to two disk arrays?

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

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