Synchronous Replication - Mixed RAID Type levels  

Result: DR failure and data corruption  

The signature

Mixed RAID types

The impact

The impact of mixing RAID type is far less critical than mixing storage types that require replication. This impact involves potential performance issues and less than optimal storage utilization.

Technical details

In this example, the production file system contains three storage volumes. Two storage volumes are RAID1 protected storage and one is RAID5 protected storage, which are replicated to the disaster recovery site. In some cases the production volumes are of the same RAID type, however, the disaster replica is of different RAID types and would potentially perform much differently for the production.

Can it happen to me?

This is a common gap when multiple RAID types are provisioned to the same host for databases, were RAID1 is used for logs and indexes and RAID5 is used for table spaces. Or, when different tiers of storage defined by RAID type are offered to the business.