Re: raid10 redundancy

Phil Turmel writes:

No, rebuild isn't just writing to the new disk.  You have to read other 
disks to get the data to write.  In raid6, you must read at least n-2 
drives, compute, then write.  In raid10, you just read the other drive 
(or one of the other drives when copies>2), then write.

Yes, but the data is striped across those multiple disks, so reading
them in parallel takes no more time.  At least unless you have a
memory/bus bottleneck rather than a disk bottleneck.  so again, you're
probably right if you are using blazing fast NVME drives, but not for
conventional HDD.