Would you say that raid-6 is suitable for storing mission-critical data, then?
What I'd say is that I don't have any evidence it's not. Unfortunately, that's not quite the same thing.
I have a .5TB raid5 array on 5 IDE disks, and given what has been said recently about disk MTBF's and RAID failure recovery, I'm thinking it might be best to switch to raid-6.
I guess such a switch is best implemented as {make backup, reformat, restore}, if I went ahead?
Yes, right now there is no RAID5->RAID6 conversion tool that I know of.
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