resync (what is it doing when making a new array?)

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Hello All,

I've gone through the faq, archives, newsgroups, google etc.

I cannot find an answer to my question: After creating a new array, why is the
time consuming resync required?


I've built a few hardware RAID 5 arrays in my time using Mylex, Adaptec, AMI
etc. I don't recall this hours long, sometimes days long initial resync using
hardware raid.

What's written to the disks using linux raid, and why isn't it used in hardware
raids?

Thanks,
~e

(watching a raid 5 array, composed of five 250gb disks, resyncing...to be
completed 16 hours from now...)

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