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High Availability and Data Protection with Dell PowerScale Scale-Out NAS
Executive summary High availability and reliability at the petabyte scale
Introduction
Areal density and drive rebuild times
Silent data corruption
Data protection continuum
High availability with OneFS OneFS fault tolerance High availability and data protection strategies Summary OneFS glossary

Data protection continuum

Home > Storage > PowerScale (Isilon) > Product Documentation > Data Protection > High Availability and Data Protection with Dell PowerScale Scale-Out NAS > Data protection continuum

Data protection continuum

  • The availability and protection of data can be usefully illustrated in terms of a continuum:

    Graphic illustrating the data protection continuum, with redundancy and fault tolerance at the beginning, moving through snapshots, replication, and finally backup to tape or VTL.

    Figure 1.   Data protection continuum

    At the beginning of the continuum sits high availability. This requirement is usually satisfied by redundancy and fault tolerant designs. The goal here is continuous availability and the avoidance of downtime by the use of redundant components and services.

    Further along the continuum lie the data recovery approaches in order of decreasing timeliness. These solutions typically include a form of point-in-time snapshots for fast recovery, followed by synchronous and asynchronous replication. Finally, backup to tape or a virtual tape library sits at the end of the continuum, providing insurance against large-scale data loss, natural disasters, and other catastrophic events.