DEA-3TT2 Exam Dumps - EMC DCA-DPM Questions and Answers

Explanation

If the data loss occurred on Friday, restoration process needs a full backup and the last differential backup that happened on a day before Friday. In case of an incremental backup, all the backup copies that occurred before Friday would be needed including the full backup copy that occurred on Saturday.

CAS assures the genuineness of stored content. This is achieved by generating a unique content address for each object and validating the content address for stored objects at regular intervals. Content authenticity is assured because the address assigned to each object is as unique as a fingerprint. Every time an object is read, CAS uses a hashing algorithm to recalculate the object’s content address as a validation step and compares the result to its original content address. If the object fails validation, CAS rebuilds the object using a mirror or parity protection scheme.

In a typical erasure coded storage system, a set of n disks is divided into m disks to hold data and k disks to hold coding information, where n, m, and k are integers. The coding information is calculated from the data. If up to k of the n disks fail, their contents can be recomputed from the surviving disks.