LVM and partition location

Damien Hull dhull at digitaloverload.net
Sun Aug 13 21:07:36 UTC 2006


Gabriel Dragffy wrote:
> David Abrahams wrote:
>
>   
>> It's often recommended to keep your swap/, var/ and tmp/ near the
>> center of a drive for speed reasons, but as far as I know LVM gives
>> you little control over the physical location of logical volumes.  How
>> do LVM users normally handle this?
>>
>> Thanks in advance,
>>
>>  
>>
>>     
>
> Am I mistaken in thinking that it's actually the outter edges of the 
> platter that reap the highest performance. Imagine if you run in a 1 
> metre circle in 1 second, and then "push out" a little further to, say, 
> 3 metres, but you must still travel this distance in one second so 
> you're going to go faster. The outside of a hard disc platter must 
> travel more quickly to stay with the inside of the platter, thus 
> increasing the the head travel. Also more data can be stored 
> consecutively in the larger outside margins of a platter. I ain't got 
> nothing to back this up, and can't give anything scientific, so I can 
> well understand if I am misplaced in my assumptions.
>
>   
I don't know much about this subject but I think it has to do with the 
read head and where it starts reading. I'm going to assume that the read 
head starts on the inside of the platter and works its way out. I think 
were talking nanoseconds here but it would take longer for the head to 
reach the outside edge then to read from the inside or starting point.




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