Messages in this thread | | | Date | Sun, 16 Jul 2006 09:38:25 -0700 | From | "Jonathan Baccash" <> | Subject | Re: raid io requests not parallel? |
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> Each head has to service 1024 write requests (compared to just 512 read > requests).
By that logic, it would take twice as long for my writes to finish. Why is it taking 4x as long in my parallel test? I don't think any of the repliers understood my question. What I want to know is, during a single direct IO write request, I would expect the raid software to issue the write request to both disks simultaneously. But the evidence indicates that isn't what is happening. I would expect a raid-1 write to take about as long to write a single block as a single write to a single disk (assuming no other disk activity), because I would expect two writes to happen concurrently. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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