how to replace kernel on Ubuntu

[David N. Lombard]

David Fox wrote:
> On Fri, Oct 9, 2009 at 2:08 AM, loody <miloody at gmail.com> wrote:
> 
>> 1. what is UUID used for? It seems replace "root=/dev/sda1"
>>    is there any tool or command I have to do to getting this number?
> 
> It stands for Unique User ID. It is a unique number that uniquely
> identifies a specfic volume to avoid behavior that might arise
> depending on inserting/removing certain USB sticks, which could cause
> the stick to be mounted wrongly which causes problems. It is much more
> useful on removable storage than on fixed storage, but you never know
> what will happen in the future, you may decide to upgrade and install
> the drives wrong, which could be disastrous :(.

Universally Unique ID.  It's very useful when you have hot-swap devices 
or multi-path.  It allows the sw to identify the specific volume even if 
the device name has changed, e.g., from first slot to second slot.

-- 
dnl