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7 mirrors striped can potentially be more or less fault tolerant. In theory, 7 drives can fail without any data loss or performance penalty. Or just one if two in the same mirror fail.

Raidz2 would handle 2 disk failures regardless of which disks.

Striped mirrors will perform better, especially if using Virtual Machines (Where raidz/raid5 has major issues).

Are you building a NAS, right?

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