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Why does this happen when copying files

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I want to copy a bunch of data from my harddrives to a new hard drive.

How ever this pattern has been going on for quite some time now and slows down the transfer speed by a lot.

First it reads data, then starts to write to the new disk. Why isn't it reading and writing at the same time.

At first I thought it had to do with parity, but I removed it from the array.

It's moving from a Toshiba 3.5" 2TB drive to a Seagate 5TB 2.5" drive.

When I precleared the drive it was constantly going between 110 and 140 MB/s

I enabled reconstruct write for the parity, but that shouldn't have any effect when the parity is disbaled...

 

Thanks in advance,

I would love to hear a reason.

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