Re: Lower HD transfer rate with NCQ enabled?

From: Phillip Susi
Date: Tue Apr 03 2007 - 15:17:53 EST


Mark Lord wrote:
But WD drives, in particular the Raptor series, have a firmware "feature"
that disables "drive readahead" whenever NCQ is in use.

Why is this an issue? Shouldn't the kernel be sending down its own readahead requests to keep the disk busy?



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