raid5 rebuild/resync speed.

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I recently read an article that claimed the default mode of --create (to start 
with a spare and rebuild it into the array) was faster than doing a full 
resync.

It turns out its not on my system. With the default --create the rebuild goes 
at 60MB/s or so, while when passing -f it goes at around 80MB/s. using the -f 
option to --create saves nearly 2 hours when building a fresh 4x2T raid array.

Is there a reason the default is still rebuilding a spare into the new array?

-- 
Thomas Fjellstrom
tfjellstrom@xxxxxxx
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