Re: partitioning order and IO performance

[Ross Walker <rswwalker@xxxxxxxxx>]

On Dec 22, 2009, at 10:14 PM, John R Pierce <pierce@xxxxxxxxxxxx> wrote:

> Ross Walker wrote:
>> Also, for random IO the opposite is true, the rotational latency is
>> significantly smaller on the inner tracks than the outer tracks, so
>> random OPs perform better there.
>>
>
> um, most all hard disks are CAV, so the rotational latency measured in
> milliseconds is constant throughout the disk.  usually 50% of a turn  
> is
> the assumed mean rotational latency

I think you might be confusing CAV with CLV of optical drives.

http://en.m.wikipedia.org/wiki/Constant_Angular_Velocity

-Ross

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