Add notes about storage redundancy
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@ -17,4 +17,33 @@ data corruption
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### Current State
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### Current State
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All primary data is stored
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All primary data is stored on a single 8TB drive array in hardware RAID 5. The
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array is comprised of four Western Digital Red NAS drives, each with a 3TB
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capacity. The array is fault tolerant, but not redundant. Secondary data is
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stored in one of three places: the primary array, a secondary drive array, or
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the 256GB boot drive of a single server.
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The secondary array is 470GB aggregate, comprised of four HST Travelstar 10K
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SAS drives, also in hardware RAID 5. The boot drive of the server is a consumer
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grade SSD. None of these systems are backed up or redundant.
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Primary data includes personal data including books, projects, documents,
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documentation, photos, etc. Secondary data is application configuration
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information and deployed hosting systems.
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In addition to the primary and secondary data, there is the tertiary data of
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a media collection (movies, TV, etc). Tertiary data is stored on the primary
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drive array, only because there is nowhere else with enough capacity to store
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it.
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### Desired State
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Data should be more efficiently segregated by priority tier. The two drive
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arrays should be split up into two arrays each: a pair of 3TB arrays using the
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WD Red's and a pair of 146GB array's using the Travelstars. Each pair of arrays
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should be installed into the two [Dell R410's](../hardware/poweredge-r410.md).
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Secondary data exists on the 146GB arrays on each server and is routinely
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backed up to the 3TB arrays on the same server.
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Primary data should be cloned on both of the 3TB arrays. Primary data should
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be backed up externally to a third server.
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