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query regarding :RAID
Hi,
I am planning to build system where it is possible to create 100's of array(raid 5) at a time, that means some of them can go faulty even before init-task is complete.If INIT hasn't completed then there is no way to rebuild the array(?). Lets say raid-subsystem does things this way. We bypass init. Array is RUNNING The stripes are always cached in memory. a)whenever a cache miss happens we read the whole stripe(except parity). b) whenever we write to the disk we recompute parity based on the data and write it to disk. c)Now if a single disk fault happens the array is in REBUILD REQUIRED state,for every read we recompute the parity and give the data back. The assumption here I make is that reads wont happen for locations where writes haven't happened. The exceptions are for boot sector and partition tables. I wanted to know if this is the right approach am I overlooking some aspect? Regards, Amritanshu Johri. |
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