Re: Learning about the Kernal

From	Aragorn <thorongil@telenet.be.invalid>
Newsgroups	comp.os.linux.misc
Subject	Re: Learning about the Kernal
Followup-To	comp.os.linux.misc
Date	2015-03-22 04:20 +0100
Organization	A noiseless patient Strider
Message-ID	<melcd5$6b9$1@dont-email.me> (permalink)
References	(7 earlier) <mekjno$nhb$1@dont-email.me> <mekti1$v3$2@dont-email.me> <mel14i$evu$14@reader1.panix.com> <mel1e8$ivr$1@dont-email.me> <melbtp$lov$1@reader1.panix.com>

Followups directed to: comp.os.linux.misc

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On Sunday 22 March 2015 04:11, ruben safir conveyed the following to 
comp.os.linux.misc...

> On Sun, 22 Mar 2015 01:13:45 +0100, Aragorn wrote:
> 
> 
>>> which can change from moment to moment I've learned.
>> 
>> Not, neither the PARTUUID nor the filesystem UUID are variable,
> 
> they are when you resize them, or make them for that matter...

The PARTUUID will only differ if you delete the partition and recreate 
it, not if you resize it.  The filesystem UUID will normally only differ 
if you reformat the partition.

> The name is completely random.

Yes, and that is exactly why it's unique [*], which is the idea.  What 
constitutes /dev/sda1 on one day may not be the same thing again on 
another day, depending on how the kernel enumerated the storage devices 
in the machine at boot-up.  If you however tell the kernel that the root 
partition is a partition with a given PARTUUID or a filesystem with a 
given UUID, then it'll use the correct partition/filesystem.

LABELs share roughly the same function in a more human-readable format, 
but the problem is that LABELs are not guaranteed to be unique.  LABELs 
are assigned by the system administrator, and it is always possible for 
the biological unit between the keyboard and the chair to screw up and 
use duplicate LABELs.

[*] Unless you clone a partition or filesystem, of course.

> The naming scheme was designed by individuals who want to drive people
> away from their computers.

That's not the point.  In terms of uniqueness and consistency at 
mounting the right filesystems at the right places, UUID and PARTUUID 
run rings around the old /dev/<something> designation with a radius of 
one lightyear across.

-- 
= Aragorn =

         http://www.linuxcounter.net - registrant #223157

Thread

Learning about the Kernal ruben safir <ruben@mrbrklyn.com> - 2015-03-14 19:59 -0400
  Re: Learning about the Kernal Xavier Roche <xroche@free.fr.NOSPAM.invalid> - 2015-03-15 11:11 +0100
    Re: Learning about the Kernal ruben <nowhere@nowhere.nor> - 2015-03-15 21:14 +0000
      Re: Learning about the Kernal Tauno Voipio <tauno.voipio@notused.fi.invalid> - 2015-03-16 10:02 +0200
        Re: Learning about the Kernal Ruben Safir <mrbrklyn@panix.com> - 2015-03-17 00:18 +0000
          Re: Learning about the Kernal Bobbie Sellers <bliss-sf4ever@dslextreme.com> - 2015-03-16 20:53 -0700
            Re: Learning about the Kernal ruben safir <dont@email.me> - 2015-03-17 05:14 +0000
            Re: Learning about the Kernal ruben safir <dont@email.me> - 2015-03-17 05:23 +0000
      Re: Learning about the Kernal Dan Espen <despen@verizon.net> - 2015-03-16 21:58 -0400
        Re: Learning about the Kernal ruben safir <dont@email.me> - 2015-03-17 05:21 +0000
          Re: Learning about the Kernal Rich <rich@example.invalid> - 2015-03-17 10:51 +0000
          Re: Learning about the Kernal Dan Espen <despen@verizon.net> - 2015-03-17 09:10 -0400
            Re: Learning about the Kernal ruben safir <ruben@mrbrklyn.com> - 2015-03-17 14:12 -0400
              Re: Learning about the Kernal William Unruh <unruh@invalid.ca> - 2015-03-17 19:03 +0000
                Re: Learning about the Kernal ruben safir <dont@email.me> - 2015-03-17 19:08 +0000
                Re: Learning about the Kernal Dan Espen <despen@verizon.net> - 2015-03-17 15:17 -0400
                Re: Learning about the Kernal ruben safir <dont@email.me> - 2015-03-20 01:06 +0000
                Re: Learning about the Kernal Dan Espen <despen@verizon.net> - 2015-03-19 23:52 -0400
                Re: Learning about the Kernal Rich <rich@example.invalid> - 2015-03-20 10:52 +0000
                Re: Learning about the Kernal Jerry Peters <jerry@example.invalid> - 2015-03-20 20:33 +0000
                Re: Learning about the Kernal ruben safir <ruben@mrbrklyn.com> - 2015-04-20 09:48 -0400
              Re: Learning about the Kernal Dan Espen <despen@verizon.net> - 2015-03-17 15:08 -0400
                Re: Learning about the Kernal ruben safir <dont@email.me> - 2015-03-18 03:36 +0000
                Re: Learning about the Kernal Dan Espen <despen@verizon.net> - 2015-03-18 10:09 -0400
                Re: Learning about the Kernal ruben safir <dont@email.me> - 2015-03-20 01:04 +0000
                Re: Learning about the Kernal Rich <rich@example.invalid> - 2015-03-20 10:58 +0000
                Re: Learning about the Kernal Dan Espen <despen@verizon.net> - 2015-03-20 09:22 -0400
                Re: Learning about the Kernal ruben safir <dont@email.me> - 2015-03-20 18:39 +0000
                Re: Learning about the Kernal Rich <rich@example.invalid> - 2015-03-20 20:04 +0000
                Re: Learning about the Kernal Dan Espen <despen@verizon.net> - 2015-03-20 21:10 -0400
                Re: Learning about the Kernal ruben safir <dont@email.me> - 2015-03-21 05:03 +0000
                Re: Learning about the Kernal ruben safir <dont@email.me> - 2015-03-20 18:42 +0000
                Re: Learning about the Kernal Dan Espen <despen@verizon.net> - 2015-03-20 15:31 -0400
                Re: Learning about the Kernal ruben safir <dont@email.me> - 2015-03-21 05:13 +0000
                Re: Learning about the Kernal The Natural Philosopher <tnp@invalid.invalid> - 2015-03-21 09:13 +0000
                Re: Learning about the Kernal ruben <nowhere@nowhere.nor> - 2015-03-21 14:40 +0000
                Re: Learning about the Kernal Michael Black <et472@ncf.ca> - 2015-03-21 12:20 -0400
                Re: Learning about the Kernal ruben safir <dont@email.me> - 2015-03-21 19:54 +0000
                Re: Learning about the Kernal Baho Utot <baho-utot@columbus.rr.com> - 2015-03-21 17:56 -0400
                Re: Learning about the Kernal ruben safir <dont@email.me> - 2015-03-21 19:56 +0000
                Re: Learning about the Kernal Richard Kettlewell <rjk@greenend.org.uk> - 2015-03-21 16:18 +0000
          Re: Learning about the Kernal Tauno Voipio <tauno.voipio@notused.fi.invalid> - 2015-03-17 16:10 +0200
            Re: Learning about the Kernal ruben safir <ruben@mrbrklyn.com> - 2015-03-17 14:06 -0400
              Re: Learning about the Kernal William Unruh <unruh@invalid.ca> - 2015-03-17 19:00 +0000
                Re: Learning about the Kernal Tim Watts <tw_usenet@dionic.net> - 2015-03-17 19:05 +0000
                Re: Learning about the Kernal Bobbie Sellers <bliss-sf4ever@dslextreme.com> - 2015-03-17 14:17 -0700
                Re: Learning about the Kernal William Unruh <unruh@invalid.ca> - 2015-03-19 06:04 +0000
                Re: Learning about the Kernal ruben safir <dont@email.me> - 2015-03-21 08:45 +0000
                Re: Learning about the Kernal ruben safir <dont@email.me> - 2015-03-21 08:20 +0000
                Re: Learning about the Kernal Rich <rich@example.invalid> - 2015-03-21 16:09 +0000
                Re: Learning about the Kernal ruben safir <dont@email.me> - 2015-03-21 20:10 +0000
              Re: Learning about the Kernal Tauno Voipio <tauno.voipio@notused.fi.invalid> - 2015-03-17 22:39 +0200
          Re: Learning about the Kernal Chick Tower <c.tower@deadspam.com> - 2015-03-18 03:35 +0000
            Re: Learning about the Kernal ruben safir <dont@email.me> - 2015-03-21 08:47 +0000
              Re: Learning about the Kernal Jerry Peters <jerry@example.invalid> - 2015-03-21 20:19 +0000
                Re: Learning about the Kernal ruben safir <dont@email.me> - 2015-03-21 20:30 +0000
                Re: Learning about the Kernal Jerry Peters <jerry@example.invalid> - 2015-03-22 20:05 +0000
                Re: Learning about the Kernal ruben safir <ruben@mrbrklyn.com> - 2015-03-23 01:16 -0400
                Re: Learning about the Kernal Jerry Peters <jerry@example.invalid> - 2015-03-23 20:27 +0000
                Re: Learning about the Kernal ruben safir <dont@email.me> - 2015-03-25 02:57 +0000
                Re: Learning about the Kernal ruben safir <dont@email.me> - 2015-03-25 02:59 +0000
                Re: Learning about the Kernal Jerry Peters <jerry@example.invalid> - 2015-03-25 20:59 +0000
                Re: Learning about the Kernal ruben safir <ruben@mrbrklyn.com> - 2015-04-20 09:44 -0400
                Re: Learning about the Kernal Aragorn <thorongil@telenet.be.invalid> - 2015-03-22 00:07 +0100
                Re: Learning about the Kernal ruben safir <dont@email.me> - 2015-03-22 00:07 +0000
                Re: Learning about the Kernal Aragorn <thorongil@telenet.be.invalid> - 2015-03-22 01:13 +0100
                Re: Learning about the Kernal ruben safir <dont@email.me> - 2015-03-22 03:11 +0000
                Re: Learning about the Kernal Aragorn <thorongil@telenet.be.invalid> - 2015-03-22 04:20 +0100
                Re: Learning about the Kernal ruben safir <dont@email.me> - 2015-03-22 13:19 +0000
                Re: Learning about the Kernal Rich <rich@example.invalid> - 2015-03-22 15:13 +0000
                Re: Learning about the Kernal Aragorn <thorongil@telenet.be.invalid> - 2015-03-22 21:52 +0100
                Re: Learning about the Kernal Jerry Peters <jerry@example.invalid> - 2015-03-22 20:13 +0000
                Re: Learning about the Kernal Aragorn <thorongil@telenet.be.invalid> - 2015-03-22 22:01 +0100
              Re: Learning about the Kernal Chick Tower <c.tower@deadspam.com> - 2015-03-23 04:02 +0000
                Re: Learning about the Kernal Aragorn <thorongil@telenet.be.invalid> - 2015-03-23 05:13 +0100
                Re: Learning about the Kernal ruben <ceo@iran.gov> - 2015-04-12 13:03 +0000
      Re: Learning about the Kernal ruben safir <dont@email.me> - 2015-03-17 05:18 +0000
      Re: Learning about the Kernal ruben safir <ruben@mrbrklyn.com> - 2015-03-17 01:52 -0400

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