Adding a drive

[Steve Morris]

On 06/04/10 08:23, Alan Dacey Sr. wrote:
> On Monday 05 April 2010 10:07:49 am Basil Chupin wrote:
>    
>> On 05/04/10 23:53, Tom H wrote:
>>      
>>> On 05/04/10, Steve Morris wrote:
>>>        
>>>>> Just a comment on this process. I is my experience that the only safe
>>>>> method of mounting a partition is to ensure that at format time a
>>>>> label is specified for the partition and use the label in the fstab
>>>>> entry, uuid is terribly unreliable.
>>>>> Uuid is unreliable as a partition identifier because moving a
>>>>> partition changes the uuid, deleting and recreating a partition in the
>>>>> same physical place changes the uuid and an inplace resize of a
>>>>> partition changes the uuid.
>>>>>            
>>> On 05/04/2010, Basil Chupin wrote:
>>>        
>>>> Ah, a most interesting point. I have taken a note of this, thanks very
>>>> much.
>>>>          
>>> Not using a UUID goes against Ubuntu standard practice (and upcoming
>>> Debian standard practice).
>>>
>>> It should be standard operating procedure for anyone about to embark
>>> on any of the above partition changes to make a note of the UUIDs (if
>>> she/he does not have this information saved offline) in order to
>>> reassign them (a very simple procedure).
>>>        
>> And thanks for this.
>>
>> I understand that the use of UUIDS is a more stable way of identifying
>> HDs for grub as the BIOS may on occasions "see" them in a different
>> order on bootups.
>>
>> BC
>>      
> UUID's are the way to /always/ identify a particular partition.  Since they
> should not change vey often, it really isn't much of a problem.  The only time
> you may want to identify them by /dev/sc# is if you have a partition that you
> test new distros/releases on (that you want quick access to the data) and gets
> reformatted frequently.
> It also teaches you to make the right size partitions.  Especially if you are
> lazy!
>
>    
I wasn't suggesting the use of /dev/sc# in fstab, I was suggesting the 
use of LABEL= to identify the partition, which as far as I have been 
able to determine is only changeable by a format. The obvious issue with 
UUID= is the home partition where multi-user usage of applications like 
mail requires the home partition to be resized because the original size 
has become too small. This resizing will change the uuid, and depending 
on the distribution it is done from and the tool used can result in a 
uuid that is invalid, thereby making the partition unusable.

regards,
Steve

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