Data classification for ILM and DR.
Vital data is used in normal business processes, but doesn't mandate instantaneous recovery in order for the business to remain in operation. Vital data may also be classified as company secret. Data recovery times from seconds up to a few minutes are acceptable and vital data is normally backed up using automated virtual (disk-cached) tape libraries or economy SATA-based disk arrays. Mirroring is not normally required for vital data as replication techniques such as point-in-time copy, snapshot copy and journaling are sufficient.
Sensitive data is used in normal business operations and recovery time can take minutes or hours without causing severe operational impact. With sensitive data, alternative sources for accessing or reconstructing the data exist in case of data loss. Tape has been the mainstay backup choice and potentially the new MAID storage category will provide another viable and cost-effective technology option.
Non-critical data averages about 40% of all data stored online, making it the largest classification level. Non-critical data has relatively low security requirements and duplicate copies often exist. Lost, corrupted or damaged data can be reconstructed with minimal effort and cost, and acceptable recovery times can range from hours to several days, in some cases, since this data is not essential for business survival. E-mail archives, digital records and personal data files often fit this profile.
From "Storage Navigator" by permission of Fred Moore, president of Horison Information Strategies (Boulder, CO)
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|Title Annotation:||Storage Networking|
|Publication:||Computer Technology Review|
|Date:||Nov 1, 2004|
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