I'm going to bed soon, promise. Just one more question about RAID5: In a 3 disk RAID5, the parity bit can be used to derive the missing information if one of the disks fails. I think.
The rather simplistic example in my book has is the following (each column represents one disk) 22 12 34 65 68 3 13 9 4 the parity bits are 34, 68, and 13. So, my question is - say, for example, that disk 3 goes down. I am therefore left with 22 12 65 68 13 9 How does the system know when to add and when to subtract to get the missing values? Like how does it know not to do 22-12 and end up with 10 instead of 34? Or 65 + 68 = 133 instead of 68-65 = 3? Pointers, thoughts, and links welcome. Thanks! J -- http://www.jonwatson.ca +1.403.875.6048 _______________________________________________ clug-talk mailing list [email protected] http://clug.ca/mailman/listinfo/clug-talk_clug.ca Mailing List Guidelines (http://clug.ca/ml_guidelines.php) **Please remove these lines when replying
