UUID is stored in the filesystem so it has nothing to do with the controllers. 
In general it’s better to use UUID than device name /dev/sd…

> On 16 Feb 2017, at 13:21, Rob Malpass via Hampshire 
> <hampshire@mailman.lug.org.uk> wrote:
> 
> Hi all (sorry for various tests, had forgotten which email account I use to 
> subscribe to this list)
>  
> At present, I have a (3.5” sata) drive connected to my Ubuntu machine via one 
> of those docking station things – I couldn’t be bothered opening up the case 
> at the time and as it’s only a media server, I thought no more about it.
>  
> Now I’m considering buying a 4 bay JBOD enclosure and I’d like to move the 
> drive into that.   At present, the drive is mounted via putting its uuid in 
> the /etc/fstab.   Simple question (which I know I could work out just by 
> swapping the drive but please humour me): if I swap the drive out of its 
> caddy and put it into the jbod, will it still be noticed.   The question I’m 
> basically asking is : Is the uuid associated with the drive unit or the 
> controller in the caddy?
>  
> Cheers all – long time no post – very long story I won’t bore y’all with.
>  
> Rob
> 
>  
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