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Ideal RAID configuration for a media server

TimJar asked
Last Modified: 2016-12-08
I am looking for the fastest sequential write speeds for large files (5 to 20 TB) with some redundancy. I am using Adaptec 31605 card with BBU. I have 12 2TB SATA drives to work with. I keep a backup on another server. These are my questions:
Should I use RAID 5, 50, or 6? (RAID 10 doesn't geive me enough storage for expansion)
Should I use 1024kb stripe size?
Will write cache help me at all?
If RAID 50 is best, what configuration will have fastest write speed? 3x4, 4x3, or 2x6

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