On 16 February 2017 at 12:21, 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?

​AFAIK the UUID is on the _filesystem_. i.e. using a cloner (dd) will
duplicate the UUID onto a separate partition - this can cause problems when
trying to mount-by-UUID due to two instances of the same supposedly unique
identifier. The 4-bay enclosure, if it is connected to a standard PC
exposing the disks as individual disks with partitions then everything will
carry-on working fine. However, if it is a "smart" enclosure (which exposes
a single device to a PC) or a NAS enclosure (connected to the network
rather than a PC) with it's own OS then you will likely not be able to
access the linux partitions on the drive because the enclosure wants to do
everything itself.

Daniel Llewellyn
Please post to: Hampshire@mailman.lug.org.uk
Web Interface: https://mailman.lug.org.uk/mailman/listinfo/hampshire
LUG URL: http://www.hantslug.org.uk

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