MySQL Replication + RAID DISK ARRAY redundancy ? (no replies)

I'm still new to MySQL replication, just started playing with Tungsten Replicator as well but was wondering if I'm correct in understanding the below MySQL replication setup correctly ?

If I have a single server with 2x MySQL server instances running in master/slave roles and each MySQL server's data directory was on it's own raid array would it be correct to assume the following:

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server config 1
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mysql master = 2x disk raid 1 #1
mysql slave = 2x disk raid 1 #2

Assumption: I can afford to loose up to 3 disks from both raid 1 based arrays ?
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server config 2
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mysql master = 4x disk raid 10 #1
mysql slave = 4x disk raid 10 #2

Assumption: I can afford to loose up to 6 disks from both raid 10 based arrays ?
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thanks