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Dell PowerVault MD 34XX/38XX Series Storage Arrays CLI Guide

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Data Assurance (DA) Feature

The Data Assurance (DA) feature increases data integrity across the entire storage system. DA enables the storage array to check for errors that might occur when data is moved between the hosts and the physical disks. When this feature is enabled, the storage array appends error-checking codes (also known as cyclic redundancy checks or CRCs) to each block of data in the virtual disk. After a data block is moved, the storage array uses these CRC codes to determine if any errors occurred during transmission. Potentially corrupted data is neither written to disk nor returned to the host. If you want to use the DA feature, start with a virtual disk group or disk pool that includes only physical disks that support DA. Then, create DA-capable virtual diskss. Finally, map these DA-capable virtual diskss to the host using an I/O interface that is capable of DA. I/O interfaces that are capable of DA include Fibre Channel, SAS, and iSER InfiniBand (iSCSI Extensions for RDMA/IB). DA is not supported by iSCSI over TCP/IP, or by the SRP InfiniBand.
  • NOTE: When all the required hardware and the I/O interface is DA-capable, you can set the dataAssurance parameter to enabled and then use DA with certain operations. For example, you can create a virtual disk group that includes DA-capable physical disks, and then create a virtual disk within that disk group that is DA-enabled. Other operations that use a DA-enabled disk have options to support the DA feature.

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