[ale] Ubuntu help

[Jim Kinney]

2009/1/27 Michael B. Trausch <mike at trausch.us>:
> On Mon, 26 Jan 2009 14:07:29 -0500
> Jim Kinney <jim.kinney at gmail.com> wrote:
>>
>> [jkinney at porter ~]$ blkid
>> /dev/sda1: LABEL="/boot" UUID="9a41cb7e-bdf9-423b-b184-72b518da9fa9"
>> TYPE="ext3" SEC_TYPE="ext2"
>> /dev/sda3: UUID="z3d6hO-o8kP-XKU3-2SiI-EctM-llec-2hkhJV" TYPE="lvm2pv"
>> /dev/sda2: UUID="dVS8hD-AfNC-U1li-4Oao-Wwib-fC0s-MoHc9g" TYPE="lvm2pv"
>>
>> As can be seen, crypto mounted hard drives rely on UUID strings.
>>
>> And yes, I name my machines after beer styles :-)  alt was a hard
>> machine to work with and was retired from service.
>>
>
> Those LVM identifiers look interesting.  Are they just random
> alphanumeric strings?

Yes. LVM generates it's own UUID strings (they are longer that the
hardware ones). I _think_ it uses the hardware UUID for the physical
drive as a "seed" for the generator. I glanced too briefly at that the
docs and code to be sure (it worked so I kept going..). Note the lvm
UUID is NOT hex values but the physical UID is hex.
>
>        --- Mike
>
> --
> My sigfile ran away and is on hiatus.
> http://www.trausch.us/
>
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-- 
-- 
James P. Kinney III