Word of the Day: Secondary Storage #Secondarystorage, sometimes called #auxiliary or #external storage, is non-volatile storage that is not under the direct control of a computers central processing unit (#CPU) or does not directly interact with an application. Typically, secondary storage is used to back up primary storage through replication, which involves holding a secondary copy of the data. To choose an effective secondary storage media, one must first understand the datas value, how often its used and how it will be accessed. External hard drives, portable flash drives, CDs, DVDs and cloud backup are often used for secondary storage. In a business environment, an older network-attached storage (#NAS) box, #SAN array or tape may be used for secondary storage. Object storage systems can also be used as an inexpensive way to implement secondary storage and lessen the demand on primary storage arrays. The growth of corporate data has prompted many storage managers to move data to secondary storage to ease the strain on primary storage systems, reclaim more expensive storage arrays and maintain older data in an easily accessible form to satisfy business and regulatory requirements. Secondary storage is usually asynchronous; as a result, the data in secondary storage may not be as current as the data in primary storage, especially when backups are not policy-driven and automated. Generally, secondary storage devices perform at a lower level than secondary storage and are less expensive. For many companies, placing a second class of storage between their primary storage and archived storage is the first step toward a tiered storage environment.
Posted on: Tue, 12 Aug 2014 16:20:11 +0000
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