access to hard drives is "blocked" by writes to a flash drive

[Poul-Henning Kamp]

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In message <201303040301.r2431Rjm008175 at gw.catspoiler.org>, Don Lewis writes:

>When using TCQ or NCQ, perhaps we should limit the number of outstanding
>writes per device to leave some slots open for reads.  We should
>probably also prioritize reads over writes unless we are under memory
>pressure.

Camera-grade flash seldom support either, they are strictly serial.

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