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That's what RAID5 does. It protects from single drive failure by placing an "error-correcting code" on an alternate disk. Unless you're talking about error-corr
by logicalmind 17y ago
That's what RAID5 does. It protects from single drive failure by placing an "error-correcting code" on an alternate disk. Unless you're talking about error-correcting codes on a single disk, eg. within the filesystem. But this doesn't solve the same problem as RAID is intended to solve.
- aplusbi 17y agoTechnically that's RAID 4, 5 distributes the parity across all disks.
- JulianMorrison 17y agoParity is a very weak ECC, basically. A more complex one of the sort used in outer-space networking can detect and rescue large swathes of destruction, or even tolerate it and prioritize relocation of the most damaged data. It doesn't protect against outright drive failure, but straight-up mirroring will do that. This is of course at the cost of tunable space wastage.