Peter T. Breuer wrote:
And there is a risk of silent corruption on all raid systems - that is
well known. DIfferent raid systems do different thigs to compensate,
such as periodically recalculating the parity on everything. But when
you have redundant data and a corruption occurs, which of the two
datasets do you believe? You have to choose one of them! You guess
wrong half the time, if you guess ("you" is a raid system). Hence
"silent corruption".
Just on this point. With RAID-6 I guess you can get a majority rules type of ruling on which data block is the dud. Unless you come up with 3 different results in which case something is really not right in lego land.
I wonder perhaps about a userspace app that you can run to check all the parity blocks. On RAID-5 it should be able to tell you, you have a naff stripe, but on RAID-6 in theory if it's only a single drive that is a problem you should be able to correct the block.
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