Greg Freemyer wrote:
I'm hearing of people saying a 2 disk mirror (raid-1) is not safe enough. Go with either a 3 disk mirror or to raid-6. Even with raid-6 I personally would not let it have too many spindles. (Whatever too many means?)
IMO, RAID-1 was never safe. With RAID-1, one must rely solely on "knowing" which RAID component is bad. With a completely dead drive, this is obvious; with slowly creeping bad sectors, far less obvious.
Plus, the biggest crime, in my opinion, is the lack of checksumming or any other method of actually verifying your data.
I've been waiting for years for someone to write RAID-1f... RAID-1 with a hash function that writes checksums in a special metadata area (just like the other pre-existing RAID metadata... a RAID partition is really a just simple filesystem anyway).
That way you _know_ with 100% certainty that your data is OK (or not), even if you only have a single drive.
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